{
  "schema": "canli.company-reference.v1",
  "cik": "0000808326",
  "name": "EMCORE CORPORATION",
  "selection_policy": "extended-v23",
  "source_url": "https://data.sec.gov/api/xbrl/companyfacts/CIK0000808326.json",
  "source_sha256": "9926bf6836ed522c595d6c6e109a62731ca4608a35085306378fd38cd49f10b6",
  "fetched_at": "2026-09-21T17:17:12.492Z",
  "policy": "Latest-filed annual-report facts per unit and reporting period at capture time. Duration facts cover 300 to 400 days. This selection can include restatements and is not a point-in-time backtest dataset. Missing concepts are omitted, never zero-filled. Values retain original units and are not currency converted. Extended concepts require compatible unit shapes and at least three reporting ends with changing values within one unit. Constant or incompatible added histories are omitted.",
  "claim_boundary": "Public company accounting reference, not market prices, returns, an investment recommendation, or ALPHAC performance. Validate a separately constructed return series with the validation API; accounting values are not returns.",
  "concepts": [
    {
      "tag": "Assets",
      "taxonomy": "us-gaap",
      "label": "Total assets",
      "kind": "instant",
      "meaning": "Resources recognized on the balance sheet. Book assets are not the market value of the business.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 93913000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 143913000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 189082000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 180813000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 126241000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-10-01",
          "val": 114362000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 109562000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 129266000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 144084000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 127211000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 160907000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 191342000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 173714000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 169866000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 170298000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 177838000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Liabilities",
      "taxonomy": "us-gaap",
      "label": "Total liabilities",
      "kind": "instant",
      "meaning": "Recognized obligations at the reporting date. The definition and scope differ from interest-bearing debt.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 43747000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 63623000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 71114000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 43347000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 52092000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-10-01",
          "val": 37616000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 32816000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 22461000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 23310000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 19894000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 25465000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 78995000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 72535000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 100843000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 71862000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 64406000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "StockholdersEquity",
      "taxonomy": "us-gaap",
      "label": "Stockholders equity",
      "kind": "instant",
      "meaning": "The reported residual interest after liabilities. It is an accounting amount, not market capitalization.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 50166000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 80290000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 117968000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 137466000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 74149000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 76746000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 106805000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 120774000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 107317000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 135442000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 112347000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 101179000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 69023000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 98436000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 113432000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "CashAndCashEquivalentsAtCarryingValue",
      "taxonomy": "us-gaap",
      "label": "Cash and cash equivalents",
      "kind": "instant",
      "meaning": "Cash and qualifying short-term liquid investments under the filer’s accounting policy. Restricted cash and longer-term investments may be reported separately.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 10291000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 26211000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 25099000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 71621000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 30390000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 21574000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 63117000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 68333000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 63905000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 111885000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 20687000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 16104000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 9047000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 15598000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 19944000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2010Q3I",
          "unit": "USD"
        },
        {
          "end": "2009-09-30",
          "val": 14028000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2009Q3I",
          "unit": "USD"
        },
        {
          "end": "2008-09-30",
          "val": 18227000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2008Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetIncomeLoss",
      "taxonomy": "us-gaap",
      "label": "Net income or loss",
      "kind": "duration",
      "meaning": "Reported profit or loss for the period. Check the filing for attribution, exceptional items and discontinued operations before comparing companies.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -31238000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -75359000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -24333000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 25643000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -7000000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -35984000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -17453000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 8235000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 8266000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 63100000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 4852000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 4988000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -39171000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -34219000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -23694000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": -138801000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetCashProvidedByUsedInOperatingActivities",
      "taxonomy": "us-gaap",
      "label": "Operating cash flow",
      "kind": "duration",
      "meaning": "Cash generated or used by operating activities. Working-capital timing can make this differ substantially from reported income.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -5309000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -33637000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 4225000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 11153000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -3892000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -15151000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 1470000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 11701000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": -5552000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": -3917000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 1001000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": -22105000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -15002000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -6289000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 3411000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": -29562000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PaymentsToAcquirePropertyPlantAndEquipment",
      "taxonomy": "us-gaap",
      "label": "Capital expenditure payments",
      "kind": "duration",
      "meaning": "Cash payments to acquire property, plant and equipment. This taxonomy concept does not capture every form of investment or acquisition.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 0,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 1856000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 3079000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 5358000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 4516000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 10790000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 6583000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 9600000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 5779000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 2799000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 3001000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 7242000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 12211000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 7334000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 1403000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 1323000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Revenues",
      "taxonomy": "us-gaap",
      "label": "Revenue",
      "kind": "duration",
      "meaning": "Revenue under this specific accounting concept. A missing value is not zero; filers can use other revenue concepts.",
      "observations": [
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 85617000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 122895000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 91998000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 81685000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 55514000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 60971000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 163781000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 200928000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 191278000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 176356000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "RevenueFromContractWithCustomerExcludingAssessedTax",
      "taxonomy": "us-gaap",
      "label": "Contract revenue excluding tax",
      "kind": "duration",
      "meaning": "Revenue from customer contracts excluding assessed taxes under this specific taxonomy concept. It is not automatically comparable to older revenue tags.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 85896000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 97716000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 45318000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 158444000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 110128000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 87265000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 85617000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 122895000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetCashProvidedByUsedInFinancingActivities",
      "taxonomy": "us-gaap",
      "label": "Financing cash flow",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net cash from financing activities, including borrowing, repayments and transactions with owners. A positive amount does not establish operating profitability.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -10642000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 24400000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 15200000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 33725000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 1499000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 5799000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -487000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 1306000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": -38254000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": -70266000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 6576000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 25284000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 3015000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 17887000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 2365000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 12100000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetCashProvidedByUsedInInvestingActivities",
      "taxonomy": "us-gaap",
      "label": "Investing cash flow",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net cash from investing activities, including asset purchases, disposals and investment transactions. This differs from capital expenditure payments alone.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 31000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 9470000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -62697000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": -3837000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 10887000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -31803000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -6501000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": -9126000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": -3826000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 164169000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": -3261000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 3829000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 5274000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -15286000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -316000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 13267000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "RetainedEarningsAccumulatedDeficit",
      "taxonomy": "us-gaap",
      "label": "Retained earnings or deficit",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Accumulated undistributed earnings or deficit at the reporting date. This balance is not cash available for distribution.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": -728696000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": -697458000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": -622099000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": -597766000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": -623409000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": -616409000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": -580425000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": -562972000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": -571207000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": -579687000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": -642787000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": -647639000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": -652627000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": -613456000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": -587259000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "WeightedAverageNumberOfSharesOutstandingBasic",
      "taxonomy": "us-gaap",
      "label": "Basic weighted-average shares",
      "kind": "duration",
      "unitKind": "shares",
      "meaning": "Time-weighted shares used for basic earnings per share. This denominator differs from shares outstanding at a single reporting date.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 9020000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "shares"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 5151000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "shares"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 37269000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "shares"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 34020000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "shares"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 29136000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "shares"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 27983000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "shares"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 27266000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2018",
          "unit": "shares"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 26659000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 25979000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 30012000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 30453000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 26531000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 23559000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 22228000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 20792000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "shares"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 79140000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "shares"
        }
      ]
    },
    {
      "tag": "WeightedAverageNumberOfDilutedSharesOutstanding",
      "taxonomy": "us-gaap",
      "label": "Diluted weighted-average shares",
      "kind": "duration",
      "unitKind": "shares",
      "meaning": "Weighted-average shares used for diluted earnings per share. Potential shares are included under the applicable dilution rules, not simply added to outstanding shares.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 9020000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "shares"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 5151000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "shares"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 37269000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "shares"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 35789000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "shares"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 29136000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "shares"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 27983000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "shares"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 27266000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "shares"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 27544000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 26518000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 30012000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 30777000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 26531000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 23559000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 22228000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 20792000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "shares"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 79140000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "shares"
        }
      ]
    },
    {
      "tag": "EarningsPerShareBasic",
      "taxonomy": "us-gaap",
      "label": "Basic earnings per share",
      "kind": "duration",
      "unitKind": "per-share",
      "meaning": "Reported earnings or loss per basic common share or unit. Inspect attribution, share classes and restatements before comparing periods. This is not a market return.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -3.46,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD/shares"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -14.63,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD/shares"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -0.65,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD/shares"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 0.75,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD/shares"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -0.24,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD/shares"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -1.29,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD/shares"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -0.64,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018",
          "unit": "USD/shares"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 0.31,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 0.32,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 2.1,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 0.16,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD/shares"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 0.19,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -1.66,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD/shares"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -1.54,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -1.14,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD/shares"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": -1.75,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD/shares"
        }
      ]
    },
    {
      "tag": "EarningsPerShareDiluted",
      "taxonomy": "us-gaap",
      "label": "Diluted earnings per share",
      "kind": "duration",
      "unitKind": "per-share",
      "meaning": "Reported earnings or loss per share under dilution rules. Antidilutive instruments may be excluded. A diluted value can equal the basic value without implying no potential dilution.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -3.46,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD/shares"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -14.63,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD/shares"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -0.65,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD/shares"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 0.72,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD/shares"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -0.24,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD/shares"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -1.29,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD/shares"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -0.64,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018",
          "unit": "USD/shares"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 0.3,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 0.31,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 2.1,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 0.16,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD/shares"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 0.19,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -1.66,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD/shares"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -1.54,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -1.14,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD/shares"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": -1.75,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD/shares"
        }
      ]
    },
    {
      "tag": "IncomeTaxExpenseBenefit",
      "taxonomy": "us-gaap",
      "label": "Income tax expense or benefit",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Current and deferred income tax expense or benefit for continuing operations. This accounting expense differs from cash taxes paid.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 29000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 42000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -139000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 572000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 60000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 54000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -449000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 163000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 14000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": -2191000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": -24600000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": -3393000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 1644000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 0,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 0,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PropertyPlantAndEquipmentNet",
      "taxonomy": "us-gaap",
      "label": "Net property, plant and equipment",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Carrying amount of property, plant and equipment after accumulated depreciation, depletion and amortization. It is not replacement cost or market value.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 7868000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 15517000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 24576000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 22544000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 21052000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 37223000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 18216000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 16635000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 12213000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 8925000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 10446000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 49744000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 47896000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 46786000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 46990000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ShareBasedCompensation",
      "taxonomy": "us-gaap",
      "label": "Share-based compensation expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Reported noncash expense for share-based payment arrangements. Noncash treatment does not mean the awards have no economic cost to shareholders.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 548000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 5438000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 4569000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 4180000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 3517000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 2607000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 3648000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 3602000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 2086000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 4586000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 4439000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 4209000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 7756000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 7428000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 9860000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 8054000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OperatingIncomeLoss",
      "taxonomy": "us-gaap",
      "label": "Operating income or loss",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Operating revenue less operating expenses for the reporting period. It excludes items outside the reported operating result and is not free cash flow.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -24549000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -48740000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -41036000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 18981000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -7034000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -36132000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -18311000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 7741000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 2939000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": -4522000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": -20331000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": -8945000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -35625000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -32527000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -21426000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": -140966000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AssetsCurrent",
      "taxonomy": "us-gaap",
      "label": "Current assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Assets classified as current under the normal operating cycle or one-year boundary. Not all current assets can be converted immediately into cash.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 55016000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 92386000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 74923000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 144319000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 90110000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 71969000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 109418000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 124685000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 111216000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 151685000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 103891000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 100297000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 95406000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 91351000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 98735000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "InterestExpense",
      "taxonomy": "us-gaap",
      "label": "Interest expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Borrowing costs recognized as interest expense. This is distinct from cash interest paid and may not include every capitalized borrowing cost.",
      "observations": [
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 642000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 439000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 542000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "LiabilitiesCurrent",
      "taxonomy": "us-gaap",
      "label": "Current liabilities",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Obligations classified as current under the operating-cycle or one-year boundary. The balance includes more than short-term borrowing.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 18462000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 28791000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 25370000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 27820000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 29053000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-10-01",
          "val": 31519000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 30719000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 20570000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 21643000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 18259000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 23691000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 72977000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 63101000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 91435000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 67058000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 63844000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccountsPayableCurrent",
      "taxonomy": "us-gaap",
      "label": "Current accounts payable",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Current amounts owed to suppliers for goods and services received. This is one component of current liabilities, not all accrued obligations.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 8563000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 9683000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 10379000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 16686000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 16484000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 10701000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 12997000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 11818000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 10575000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 7189000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 6804000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 19643000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 38814000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 26581000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 26156000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Goodwill",
      "taxonomy": "us-gaap",
      "label": "Goodwill carrying amount",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Recognized goodwill remaining after accumulated impairment. It arises from business combinations and does not measure the current value of the company’s brand.",
      "observations": [
        {
          "end": "2023-09-30",
          "val": 0,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 17894000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 69000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 69000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 69000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 0,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 20384000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 20384000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 20384000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 20384000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 20384000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "FiniteLivedIntangibleAssetsNet",
      "taxonomy": "us-gaap",
      "label": "Net finite-lived intangible assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Finite-lived intangible assets after amortization. This excludes goodwill and should not be combined with indefinite-lived intangible assets without checking scope.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 9434000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 11390000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 5940000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 167000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 202000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 239000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 0,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 0,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 82000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 2159000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 3428000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 5866000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccountsReceivableNetCurrent",
      "taxonomy": "us-gaap",
      "label": "Net current accounts receivable",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Current customer receivables after the allowance for credit loss. The balance is not cash collected or a guarantee of collection.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 14342000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 15575000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 13823000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 31849000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 25324000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 18497000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 19275000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 22265000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 18432000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 17319000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 12769000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 41826000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 36939000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 34875000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 40125000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PaymentsForRepurchaseOfCommonStock",
      "taxonomy": "us-gaap",
      "label": "Common-stock repurchase payments",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash paid to reacquire common stock during the period. This is not an authorization limit or a direct measure of the net change in share count.",
      "observations": [
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 0,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 0,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 45650000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 0,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 0,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OperatingExpenses",
      "taxonomy": "us-gaap",
      "label": "Operating expenses",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Recurring operating costs under this accounting concept, generally excluding production costs included in cost of sales. Check filing presentation before combining expense subtotals.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 43369000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 72133000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 45102000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 42507000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 42616000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 51221000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 36798000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 34793000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 28015000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 33213000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 32445000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 21211000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 53451000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 75290000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 72087000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 134656000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "InventoryNet",
      "taxonomy": "us-gaap",
      "label": "Net inventory",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Inventory carrying amount after applicable valuation and LIFO reserves. It does not establish realizable selling proceeds or inventory turnover without other inputs.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 25065000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 28905000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 26282000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 32309000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 25525000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 24051000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 22283000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 27825000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 27681000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 17130000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 15644000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 32115000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 35192000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 33166000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 32056000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "GrossProfit",
      "taxonomy": "us-gaap",
      "label": "Gross profit",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Revenue less the costs directly attributed to the goods or services sold. It precedes other operating expenses and is not net income.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 18820000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 23393000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 4066000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 61488000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 35582000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 15089000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 18487000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 42534000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 30954000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 28691000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 12114000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 12266000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 17826000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 42763000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 50661000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": -6310000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "CostOfRevenue",
      "taxonomy": "us-gaap",
      "label": "Cost of revenue",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Costs attributed to goods produced and sold and services provided during the period. This is not the sum of every operating expense.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 67076000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 74323000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 41252000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 96956000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 74546000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 72176000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 67130000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 80361000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 61044000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 52994000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 43400000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 48705000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 145955000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 158165000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 140617000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 182666000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "SellingGeneralAndAdministrativeExpense",
      "taxonomy": "us-gaap",
      "label": "Selling, general and administrative expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Selling and general administrative costs reported under this concept. It is an expense category, not a substitute for total operating expenses.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 22281000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 32731000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 28224000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 24544000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 24631000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 32080000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 21377000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 22246000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 20734000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 24711000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 23239000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 18492000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 34861000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 35582000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 42549000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 46775000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ResearchAndDevelopmentExpense",
      "taxonomy": "us-gaap",
      "label": "Research and development expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Research and development costs recognized as expense. Capitalization policies and acquired projects can make this differ from total cash invested in development.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 12922000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 17910000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 13782000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 17448000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 20269000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 19443000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 15387000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 12542000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 9921000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 9119000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 9306000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 10509000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 22338000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 32853000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 29538000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 27100000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "CommonStockSharesOutstanding",
      "taxonomy": "us-gaap",
      "label": "Common shares outstanding",
      "kind": "instant",
      "unitKind": "shares",
      "meaning": "Common shares outstanding at the reporting date. This point-in-time count differs from the weighted-average shares used for earnings per share and can exclude other share classes.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 9073000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "shares"
        },
        {
          "end": "2023-09-30",
          "val": 7711000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "shares"
        },
        {
          "end": "2022-09-30",
          "val": 37591000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "shares"
        },
        {
          "end": "2021-09-30",
          "val": 36984000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "shares"
        },
        {
          "end": "2020-09-30",
          "val": 29551000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "shares"
        },
        {
          "end": "2019-09-30",
          "val": 28893000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "shares"
        },
        {
          "end": "2018-09-30",
          "val": 27577000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "shares"
        },
        {
          "end": "2017-09-30",
          "val": 27028000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "shares"
        },
        {
          "end": "2016-09-30",
          "val": 26244000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "shares"
        },
        {
          "end": "2015-09-30",
          "val": 25676000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015Q3I",
          "unit": "shares"
        },
        {
          "end": "2014-09-30",
          "val": 31109000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2014Q3I",
          "unit": "shares"
        },
        {
          "end": "2013-09-30",
          "val": 29982000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "shares"
        },
        {
          "end": "2012-09-30",
          "val": 24372000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "shares"
        },
        {
          "end": "2011-09-30",
          "val": 23481000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "shares"
        },
        {
          "end": "2010-09-30",
          "val": 85187000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "shares"
        }
      ]
    },
    {
      "tag": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
      "taxonomy": "us-gaap",
      "label": "Cash including restricted cash",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Cash, cash equivalents and restricted cash as reported in the cash flow reconciliation. Restricted amounts are not freely available, so this is not the same as unrestricted cash.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 10786000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 26706000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 25619000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 71682000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 30538000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 21977000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 63195000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 68754000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 64870000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2016Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
      "taxonomy": "us-gaap",
      "label": "Accumulated other comprehensive income or loss",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Cumulative other comprehensive items after tax, such as translation and unrealized hedging or securities effects. These amounts have not passed through net income.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 958000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 350000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 441000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 687000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 918000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 950000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 885000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 561000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
      "taxonomy": "us-gaap",
      "label": "Total equity including noncontrolling interests",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Equity including the portion attributable to noncontrolling interests. It is larger than or equal to parent stockholders equity and is not market capitalization.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 50166000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 80290000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 117968000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 137466000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 74149000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 76746000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 106805000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 120774000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 107317000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 135442000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 112347000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 101179000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 69023000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 98436000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 113432000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2010Q3I",
          "unit": "USD"
        },
        {
          "end": "2009-09-30",
          "val": 123931000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2009Q3I",
          "unit": "USD"
        },
        {
          "end": "2008-09-30",
          "val": 253722000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2008Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OperatingLeaseRightOfUseAsset",
      "taxonomy": "us-gaap",
      "label": "Operating lease right-of-use asset",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Carrying amount of the right to use leased assets under operating leases. It reflects discounted remaining payments, not the value of the underlying property.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 18094000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 21564000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 23144000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 13489000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 14566000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-10-01",
          "val": 4800000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OperatingLeaseLiability",
      "taxonomy": "us-gaap",
      "label": "Operating lease liability",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Present value of remaining operating lease payments. Discount-rate choices and lease terms affect the amount; it is not the sum of undiscounted future rent.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 20916000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 23915000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 23838000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 13882000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 14727000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2020Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PropertyPlantAndEquipmentGross",
      "taxonomy": "us-gaap",
      "label": "Gross property, plant and equipment",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Cost of property, plant and equipment before accumulated depreciation. Historical cost does not indicate current value or replacement cost.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 15527000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 48404000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 54629000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 58595000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 53286000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 71866000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 46359000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 42459000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 35891000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 30554000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 31945000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
      "taxonomy": "us-gaap",
      "label": "Accumulated depreciation on property, plant and equipment",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Cumulative depreciation, depletion and amortization recorded against property, plant and equipment. It measures cost allocation to date, not physical wear or market value.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 7659000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 32887000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 30053000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 36051000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 32234000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 34643000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 28143000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 25824000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 23678000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 21629000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 21499000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 79900000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 74500000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-06-30",
          "val": 74500000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q2I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 105500000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IntangibleAssetsNetExcludingGoodwill",
      "taxonomy": "us-gaap",
      "label": "Net intangible assets excluding goodwill",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Intangible assets other than goodwill after amortization and impairment. Internally developed intangibles are usually not recognized, so this understates what a company relies on.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 10289000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 12245000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 14790000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 167000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 202000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2020Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OtherAssetsNoncurrent",
      "taxonomy": "us-gaap",
      "label": "Other noncurrent assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Noncurrent assets the filer does not present separately. The composition differs by filer and is described only in the filing.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 2646000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 2201000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 2351000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 225000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 242000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 62000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 199000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 78000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 251000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 297000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 512000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 1130000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 2752000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 3537000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 991000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OtherLiabilitiesNoncurrent",
      "taxonomy": "us-gaap",
      "label": "Other noncurrent liabilities",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Noncurrent liabilities the filer does not present separately. The composition differs by filer and is described only in the filing.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 4660000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 8000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 106000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 794000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 794000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 207000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 82000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 29000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 62000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 0,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 755000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 981000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 1004000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 4000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 87000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PrepaidExpenseAndOtherAssetsCurrent",
      "taxonomy": "us-gaap",
      "label": "Prepaid expenses and other current assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Prepayments and other current assets grouped under this concept. The balance is not cash and its composition differs by filer.",
      "observations": [
        {
          "end": "2022-09-30",
          "val": 7124000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 6877000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 5589000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 6389000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 6098000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 8527000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 3764000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 4976000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 5336000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 9437000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 14146000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 7168000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 5312000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2010Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ContractWithCustomerLiabilityCurrent",
      "taxonomy": "us-gaap",
      "label": "Current contract liabilities",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Consideration received before performance obligations are satisfied, often called deferred revenue. It is an obligation to deliver, not earned revenue or cash available.",
      "observations": [
        {
          "end": "2024-09-30",
          "val": 1424000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 1630000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 5271000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 368000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 502000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 541000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 390000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2018Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "DeferredTaxAssetsNet",
      "taxonomy": "us-gaap",
      "label": "Net deferred tax assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Deferred tax assets after the valuation allowance. Realization depends on future taxable income, so the balance is not a receivable from tax authorities.",
      "observations": [
        {
          "end": "2018-09-30",
          "val": 0,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 0,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 0,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 0,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 24080000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 0,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2013Q3I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
      "taxonomy": "us-gaap",
      "label": "Pre-tax income or loss from continuing operations",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Income or loss from continuing operations before income taxes and noncontrolling interests. It excludes discontinued operations and is not net income.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -26823000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -49371000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -40900000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 26215000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -6940000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -35930000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -17902000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 8384000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 2633000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": -4463000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": -20468000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": -8947000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -37527000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -34219000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -23694000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ProfitLoss",
      "taxonomy": "us-gaap",
      "label": "Profit or loss including noncontrolling interests",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net income or loss including the portion attributable to noncontrolling interests. It can differ from the net income attributable to the parent that per-share figures use.",
      "observations": [
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 25643000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -7000000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -35984000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -17453000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ComprehensiveIncomeNetOfTax",
      "taxonomy": "us-gaap",
      "label": "Comprehensive income or loss",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net income plus other comprehensive income after tax. It includes unrealized items that net income excludes and is not a cash measure.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -30630000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -75450000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -23892000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 25412000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -7032000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -35919000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -17129000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 8217000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 7998000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 62110000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 5066000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 5235000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -38707000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -34084000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -23652000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": -138615000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetIncomeLossAvailableToCommonStockholdersBasic",
      "taxonomy": "us-gaap",
      "label": "Net income available to common stockholders",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net income after preferred dividends and similar adjustments, the numerator for basic earnings per share. It can be lower than reported net income.",
      "observations": [
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 63100000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 4846000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 4962000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -39171000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -34219000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Depreciation",
      "taxonomy": "us-gaap",
      "label": "Depreciation expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Depreciation recognized for the period under this concept. It is a noncash allocation of asset cost and may exclude amortization and depletion reported elsewhere.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 3300000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 2700000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 1400000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 4000000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 5500000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 7100000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 5600000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 3700000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 2400000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 2100000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 2500000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 2400000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 7500000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "DepreciationDepletionAndAmortization",
      "taxonomy": "us-gaap",
      "label": "Depreciation, depletion and amortization",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Combined depreciation, depletion and amortization for the period. A noncash allocation of asset cost, not a measure of maintenance spending.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 5507000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 4848000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 1728000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 4061000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 5484000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 7142000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 5617000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 3757000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 2506000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 2952000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 8518000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 8688000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 9420000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 11973000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 12288000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 16082000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OtherNonoperatingIncomeExpense",
      "taxonomy": "us-gaap",
      "label": "Other nonoperating income or expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Other income or expense outside operations under this concept. The composition is filer-specific and can include one-time items.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 3581000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 120000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 171000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 0,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 110000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 316000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 0,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 0,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 51000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 0,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 0,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -15000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -370000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 0,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NonoperatingIncomeExpense",
      "taxonomy": "us-gaap",
      "label": "Nonoperating income or expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Total nonoperating income or expense, which can include interest, investment results and other items. A positive value is not operating profit.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -2274000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -631000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 136000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 7234000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 94000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 202000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 409000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 643000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": -306000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 59000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": -137000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": -2000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -1902000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -1692000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -2268000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 2165000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "DeferredIncomeTaxExpenseBenefit",
      "taxonomy": "us-gaap",
      "label": "Deferred income tax expense or benefit",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The deferred portion of income tax expense or benefit, arising from timing differences. It is not tax paid in the period.",
      "observations": [
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 0,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 0,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 24080000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": -24080000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 0,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 0,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "InterestPaidNet",
      "taxonomy": "us-gaap",
      "label": "Interest paid, net",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash interest paid during the period, net of amounts capitalized where the filer reports it that way. It differs from interest expense recognized.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 571000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 1230000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 280000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 61000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 113000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 126000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 63000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 71000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 88000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ProceedsFromIssuanceOfCommonStock",
      "taxonomy": "us-gaap",
      "label": "Proceeds from issuing common stock",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash received from issuing common stock during the period. It is gross of costs only where the filer reports it so, and it does not include noncash issuances.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 0,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 34249000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 29000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 35937000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 0,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 0,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 9653000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2011",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OperatingLeasePayments",
      "taxonomy": "us-gaap",
      "label": "Operating lease payments",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash paid for operating lease liabilities during the period. It differs from lease expense recognized and excludes variable payments in some presentations.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 3629000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 3749000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 2011000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 1975000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 1592000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncreaseDecreaseInAccountsReceivable",
      "taxonomy": "us-gaap",
      "label": "Change in accounts receivable",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The cash flow adjustment for the change in receivables during the period. A positive value under this concept means receivables grew and reduced operating cash flow.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -1137000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 1946000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -1563000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 5348000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 7518000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -3980000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -2372000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 3859000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 1171000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": -3526000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 3290000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 4967000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 1707000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -3278000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 3309000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 15967000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncreaseDecreaseInInventories",
      "taxonomy": "us-gaap",
      "label": "Change in inventories",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The cash flow adjustment for the change in inventories during the period. A positive value under this concept means inventory grew and reduced operating cash flow.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -3840000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 5989000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -2380000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 6326000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 1226000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -6486000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -5067000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 140000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 10904000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 3440000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": -5481000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": -2016000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 9807000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 883000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 361000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 32957000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncreaseDecreaseInAccountsPayable",
      "taxonomy": "us-gaap",
      "label": "Change in accounts payable",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The cash flow adjustment for the change in payables during the period. A positive value under this concept means payables grew and added to operating cash flow.",
      "observations": [
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -1121000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -522000,
          "accn": "0000808326-25-000007",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-01-14",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 1097000,
          "accn": "0000808326-23-000031",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-27",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": -420000,
          "accn": "0000808326-22-000061",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-28",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 6171000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -4539000,
          "accn": "0000808326-21-000044",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-12-03",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 477000,
          "accn": "0001558370-20-014229",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-08",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 2095000,
          "accn": "0000808326-19-000055",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-10",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 3179000,
          "accn": "0000808326-18-000031",
          "fy": 2018,
          "fp": "Q4",
          "form": "10-K",
          "filed": "2018-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": -3231000,
          "accn": "0000808326-17-000031",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-06",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 3113000,
          "accn": "0000808326-16-000081",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-07",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": -14032000,
          "accn": "0000808326-15-000038",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-12-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 10610000,
          "accn": "0000808326-14-000035",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-12",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 404000,
          "accn": "0000808326-13-000047",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-09",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 1229000,
          "accn": "0000808326-12-000126",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2008-10-01",
          "end": "2009-09-30",
          "val": 27428000,
          "accn": "0000808326-11-000070",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    }
  ],
  "source_snapshot": "/company-data/sources/9926bf6836ed522c595d6c6e109a62731ca4608a35085306378fd38cd49f10b6.json.gz"
}
