{
  "schema": "canli.company-reference.v1",
  "cik": "0001145255",
  "name": "HENNESSY ADVISORS, INC.",
  "selection_policy": "extended-v22",
  "source_url": "https://data.sec.gov/api/xbrl/companyfacts/CIK0001145255.json",
  "source_sha256": "258c92cd3d558f577b9585df9cfa8301d2b716194bdfa42ff6d92a906c17ec2c",
  "fetched_at": "2026-09-20T07:42:27.646Z",
  "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": "2025-09-30",
          "val": 160459000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2024-09-30",
          "val": 152099000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 145719000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 143652000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 101905000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 94786000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 110208000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 109480000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 97258000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 84939000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 73133000,
          "accn": "0001193125-16-782532",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-01",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 75315000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 74734000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 32902000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 32137000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 31899000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "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": "2025-09-30",
          "val": 62723000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2024-09-30",
          "val": 60788000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 57967000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 57354000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 18643000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 16608000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 34680000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 38500000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 45728000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 47608000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 50038000,
          "accn": "0001193125-16-782532",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-01",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 37901000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 44947000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 7678000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 7297000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 7399000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "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": "2025-09-30",
          "val": 97736000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2024-09-30",
          "val": 91311000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 87752000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 86298000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 83262000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 78178000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 75528000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 70980000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 51530000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 37331000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 23095000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 37414000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 29787000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2013Q3I",
          "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": "2025-09-30",
          "val": 72431000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2024-09-30",
          "val": 63922000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 60476000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 58487000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 15836000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 9955000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 24687000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 25395000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 15700000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 3535000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 3086000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 7645000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 8406000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 8730000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 8362000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 8054000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2010Q3I",
          "unit": "USD"
        },
        {
          "end": "2009-09-30",
          "val": 5747000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2009Q3I",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 9960000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 7097000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 4771000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 6190000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 7902000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 7841000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 11031000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 20615000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 14942000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 14367000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 11389000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 7667000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 4820000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 971000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 1215000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 913000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 13792000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 9277000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 7134000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 8665000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 10386000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 10623000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 14392000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 21531000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 19846000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 6158000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 2037000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 1878000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 2037000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 440000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 313000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 215000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 216000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 249000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 172000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 204000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 360000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 176000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 184000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 258000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 140000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 253000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 101000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 52000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 69000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": 54590000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 52955000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 51410000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 44739000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 34526000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 24308000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 7072000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 7644000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 7723000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 35538000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 29646000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 24020000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 29667000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 32760000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 33389000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 42715000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 54590000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": -4656000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -4528000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -4326000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 34217000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": -4256000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -24473000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -13126000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -7941000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": -7236000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 14047000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -1295000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -1518000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 403000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": -627000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": -1303000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": -819000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": -231000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": -249000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": -882000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": -1974000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": -3895000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": -445000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": -20529000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": -374000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": -52000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": -133000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2025-09-30",
          "val": 74258000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2024-09-30",
          "val": 68719000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 65952000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 65347000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 63298000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 59473000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 57855000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 54197000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 36587000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 24052000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 11441000,
          "accn": "0001193125-16-782532",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-01",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 26562000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 19839000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 15748000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 15462000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 15192000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 7787924,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "shares"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 7680706,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "shares"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 7580120,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "shares"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 7483342,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "shares"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 7367948,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "shares"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 7352495,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "shares"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 7757785,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "shares"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 7808421,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "shares"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 7691937,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 7600583,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 8831094,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 5856309,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 5810431,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 5742931,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 5728334,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 5701780,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 7828947,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "shares"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 7721781,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "shares"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 7603676,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "shares"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 7558008,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "shares"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 7409112,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "shares"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 7378729,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "shares"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 7771561,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "shares"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 7890758,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "shares"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 7790527,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 7717965,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 8941034,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 5896733,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 5810431,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 5754336,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 5743628,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 5716783,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 1.28,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD/shares"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 0.92,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD/shares"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 0.63,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD/shares"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 0.83,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD/shares"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 1.07,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD/shares"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 1.07,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD/shares"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 1.42,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD/shares"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 2.64,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD/shares"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 1.94,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 1.89,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 1.29,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 1.31,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD/shares"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 0.83,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 0.17,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD/shares"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 0.21,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 0.16,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 1.27,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD/shares"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 0.92,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD/shares"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 0.63,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD/shares"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 0.82,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD/shares"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 1.07,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD/shares"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 1.06,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD/shares"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 1.42,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD/shares"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 2.61,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD/shares"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 1.92,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 1.86,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 1.27,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 1.3,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD/shares"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 0.83,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 0.17,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD/shares"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 0.21,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 0.16,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 3660000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 2607000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 1829000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 1756000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 2979000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 3120000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 4244000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 2778000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 8307000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 8193000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 7414000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 5395000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 3332000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 761300,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 868000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 671000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "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": "2025-09-30",
          "val": 524000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2024-09-30",
          "val": 374000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 305000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 320000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 311000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 294000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 361000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 382000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 254000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 296000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 319000,
          "accn": "0001193125-16-782532",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-01",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 240000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 258000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 148336,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 136000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 180000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 1128000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 990000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 1026000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 1252000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 1438000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 1782000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 2212000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 2413000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 2118000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 1416000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 692000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 202000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 8000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 52000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 171000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 398000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 13145000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 8867000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 6334000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 9839000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 10879000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 11319000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 16021000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 24475000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 24493000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 23790000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 19814000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 14146000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 8929000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 1782000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 2147000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 1623000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2025-09-30",
          "val": 76515000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2024-09-30",
          "val": 68276000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 63701000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 61657000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 19706000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 13382000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 29012000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 30744000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 22231000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 10135000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 9412000,
          "accn": "0001193125-16-782532",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-01",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 12181000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 11682000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 9749000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 9334000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 9004000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 2293000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 2275000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 2256000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 2122000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 0,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 447000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 1084000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 1227000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 1256000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 1232000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 1012000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 1085000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 668000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 51000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 65000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 35000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2025-09-30",
          "val": 6013000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "unit": "USD"
        },
        {
          "end": "2024-09-30",
          "val": 4954000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024Q3I",
          "unit": "USD"
        },
        {
          "end": "2023-09-30",
          "val": 4192000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023Q3I",
          "unit": "USD"
        },
        {
          "end": "2022-09-30",
          "val": 4717000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022Q3I",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 5560000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 5092000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 11363000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 12035000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 12459000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 11221000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 10265000,
          "accn": "0001193125-16-782532",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-01",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 7430000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 12469000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 1847000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 1522000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 1646000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010Q3I",
          "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": "2022-09-30",
          "val": 2051000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "unit": "USD"
        },
        {
          "end": "2021-09-30",
          "val": 2795000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021Q3I",
          "unit": "USD"
        },
        {
          "end": "2020-09-30",
          "val": 2403000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020Q3I",
          "unit": "USD"
        },
        {
          "end": "2019-09-30",
          "val": 3291000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019Q3I",
          "unit": "USD"
        },
        {
          "end": "2018-09-30",
          "val": 4259000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018Q3I",
          "unit": "USD"
        },
        {
          "end": "2017-09-30",
          "val": 4325000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017Q3I",
          "unit": "USD"
        },
        {
          "end": "2016-09-30",
          "val": 4230000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016Q3I",
          "unit": "USD"
        },
        {
          "end": "2015-09-30",
          "val": 4052000,
          "accn": "0001193125-16-782532",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-12-01",
          "frame": "CY2015Q3I",
          "unit": "USD"
        },
        {
          "end": "2014-09-30",
          "val": 3142000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014Q3I",
          "unit": "USD"
        },
        {
          "end": "2013-09-30",
          "val": 2402000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013Q3I",
          "unit": "USD"
        },
        {
          "end": "2012-09-30",
          "val": 643000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012Q3I",
          "unit": "USD"
        },
        {
          "end": "2011-09-30",
          "val": 548000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011Q3I",
          "unit": "USD"
        },
        {
          "end": "2010-09-30",
          "val": 619000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "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": "2019-10-01",
          "end": "2020-09-30",
          "val": 2714000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 4750000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 25056000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 219000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "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": "2024-10-01",
          "end": "2025-09-30",
          "val": 22393000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2023-10-01",
          "end": "2024-09-30",
          "val": 20779000,
          "accn": "0001437749-25-036795",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-12-03",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2022-10-01",
          "end": "2023-09-30",
          "val": 17686000,
          "accn": "0001437749-24-037244",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-12-11",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2021-10-01",
          "end": "2022-09-30",
          "val": 19828000,
          "accn": "0001437749-23-033810",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-12-07",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2020-10-01",
          "end": "2021-09-30",
          "val": 21881000,
          "accn": "0001193125-22-300163",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-12-07",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2019-10-01",
          "end": "2020-09-30",
          "val": 22070000,
          "accn": "0001193125-21-340363",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-11-24",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2018-10-01",
          "end": "2019-09-30",
          "val": 26694000,
          "accn": "0001193125-20-307086",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-12-01",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-10-01",
          "end": "2018-09-30",
          "val": 30115000,
          "accn": "0001193125-19-305328",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-12-03",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2016-10-01",
          "end": "2017-09-30",
          "val": 28462000,
          "accn": "0001193125-18-336590",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-11-28",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-10-01",
          "end": "2016-09-30",
          "val": 27620000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2014-10-01",
          "end": "2015-09-30",
          "val": 24925000,
          "accn": "0001193125-17-360245",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-12-04",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-10-01",
          "end": "2014-09-30",
          "val": 20380000,
          "accn": "0001193125-15-390818",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-11-30",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2012-10-01",
          "end": "2013-09-30",
          "val": 15379000,
          "accn": "0001193125-14-431028",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-12-02",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2011-10-01",
          "end": "2012-09-30",
          "val": 5290000,
          "accn": "0001193125-13-462278",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-12-04",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-10-01",
          "end": "2011-09-30",
          "val": 5497000,
          "accn": "0001193125-12-493854",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-12-06",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-10-01",
          "end": "2010-09-30",
          "val": 6100000,
          "accn": "0001193125-11-336242",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-12-09",
          "frame": "CY2010",
          "unit": "USD"
        }
      ]
    }
  ],
  "source_snapshot": "/company-data/sources/258c92cd3d558f577b9585df9cfa8301d2b716194bdfa42ff6d92a906c17ec2c.json.gz"
}
