{
  "schema": "canli.company-reference.v1",
  "cik": "0000798359",
  "name": "CENTERSPACE",
  "selection_policy": "extended-v22",
  "source_url": "https://data.sec.gov/api/xbrl/companyfacts/CIK0000798359.json",
  "source_sha256": "42673dfcc9aa24e35b23cf24ce84f3626291f85d1ad3e1952af1e6e444ab6fcd",
  "fetched_at": "2026-09-19T15:05:02.549Z",
  "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": "2025-12-31",
          "val": 1926167000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "unit": "USD"
        },
        {
          "end": "2024-12-31",
          "val": 1913707000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024Q4I",
          "unit": "USD"
        },
        {
          "end": "2023-12-31",
          "val": 1926361000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2023Q4I",
          "unit": "USD"
        },
        {
          "end": "2022-12-31",
          "val": 2033301000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2022Q4I",
          "unit": "USD"
        },
        {
          "end": "2021-12-31",
          "val": 1940061000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2021Q4I",
          "unit": "USD"
        },
        {
          "end": "2020-12-31",
          "val": 1464183000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 1392418000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 1335997000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-04-30",
          "val": 1426658000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q1I",
          "unit": "USD"
        },
        {
          "end": "2017-04-30",
          "val": 1474514000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "end": "2016-04-30",
          "val": 1755022000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2016Q1I",
          "unit": "USD"
        },
        {
          "end": "2015-04-30",
          "val": 1997837000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2015Q1I",
          "unit": "USD"
        },
        {
          "end": "2014-04-30",
          "val": 1869221000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "end": "2013-04-30",
          "val": 1889554000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2013Q1I",
          "unit": "USD"
        },
        {
          "end": "2012-04-30",
          "val": 1714367000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "end": "2011-04-30",
          "val": 1615363000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-12-31",
          "val": 1080411000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "unit": "USD"
        },
        {
          "end": "2024-12-31",
          "val": 1014704000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024Q4I",
          "unit": "USD"
        },
        {
          "end": "2023-12-31",
          "val": 978776000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2023Q4I",
          "unit": "USD"
        },
        {
          "end": "2022-12-31",
          "val": 1066445000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2022Q4I",
          "unit": "USD"
        },
        {
          "end": "2021-12-31",
          "val": 918450000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2021Q4I",
          "unit": "USD"
        },
        {
          "end": "2020-12-31",
          "val": 774800000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 695956000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 686580000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-04-30",
          "val": 732451000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q1I",
          "unit": "USD"
        },
        {
          "end": "2017-04-30",
          "val": 831239000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "end": "2016-04-30",
          "val": 1029238000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2016Q1I",
          "unit": "USD"
        },
        {
          "end": "2015-04-30",
          "val": 1250515000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2015Q1I",
          "unit": "USD"
        },
        {
          "end": "2014-04-30",
          "val": 1142472000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "end": "2013-04-30",
          "val": 1128173000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2013Q1I",
          "unit": "USD"
        },
        {
          "end": "2012-04-30",
          "val": 1149104000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "end": "2011-04-30",
          "val": 1070086000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-12-31",
          "val": 719156000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "unit": "USD"
        },
        {
          "end": "2024-12-31",
          "val": 751988000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024Q4I",
          "unit": "USD"
        },
        {
          "end": "2023-12-31",
          "val": 709832000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2023Q4I",
          "unit": "USD"
        },
        {
          "end": "2022-12-31",
          "val": 729537000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2022Q4I",
          "unit": "USD"
        },
        {
          "end": "2021-12-31",
          "val": 772032000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2021Q4I",
          "unit": "USD"
        },
        {
          "end": "2020-12-31",
          "val": 618207000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 619053000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 568786000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-04-30",
          "val": 605663000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q1I",
          "unit": "USD"
        },
        {
          "end": "2017-04-30",
          "val": 560937000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "end": "2016-04-30",
          "val": 618758000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2016Q1I",
          "unit": "USD"
        },
        {
          "end": "2015-04-30",
          "val": 652110000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2015Q1I",
          "unit": "USD"
        },
        {
          "end": "2014-04-30",
          "val": 592184000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "end": "2013-04-30",
          "val": 612787000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2013Q1I",
          "unit": "USD"
        },
        {
          "end": "2012-04-30",
          "val": 432989000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "end": "2011-04-30",
          "val": 411690000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-12-31",
          "val": 12833000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "unit": "USD"
        },
        {
          "end": "2024-12-31",
          "val": 12030000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024Q4I",
          "unit": "USD"
        },
        {
          "end": "2023-12-31",
          "val": 8630000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023Q4I",
          "unit": "USD"
        },
        {
          "end": "2022-12-31",
          "val": 10458000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022Q4I",
          "unit": "USD"
        },
        {
          "end": "2021-12-31",
          "val": 31267000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021Q4I",
          "unit": "USD"
        },
        {
          "end": "2020-12-31",
          "val": 392000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 26579000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 13792000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-04-30",
          "val": 11891000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "unit": "USD"
        },
        {
          "end": "2017-04-30",
          "val": 28819000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "end": "2016-04-30",
          "val": 66698000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "frame": "CY2016Q1I",
          "unit": "USD"
        },
        {
          "end": "2015-04-30",
          "val": 48970000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "end": "2014-04-30",
          "val": 47267000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014Q1I",
          "unit": "USD"
        },
        {
          "end": "2013-04-30",
          "val": 94133000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013Q1I",
          "unit": "USD"
        },
        {
          "end": "2012-04-30",
          "val": 39989000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "end": "2011-04-30",
          "val": 41191000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011Q1I",
          "unit": "USD"
        },
        {
          "end": "2010-04-30",
          "val": 54791000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "end": "2009-04-30",
          "val": 33244000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 17101000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": -11328000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 41325000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": -14109000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": -29000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 4441000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 78669000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 116788000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 43347000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 72006000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 24087000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": -13174000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 25530000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 8212000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 20082000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2009-05-01",
          "end": "2010-04-30",
          "val": 4001000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 98453000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": 98248000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 89520000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 91991000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 84028000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 61228000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 69624000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 55195000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 79052000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 66493000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 114179000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": 92514000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 77718000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 65137000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 58774000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2009-05-01",
          "end": "2010-04-30",
          "val": 61412000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 273662000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": 260983000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 261309000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 256716000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 201705000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 177994000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 185755000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 121871000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 169745000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 160104000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 145500000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 88867000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": 80883000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 26273000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 3237000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": -69062000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": -43672000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": -212351000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 41369000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 214512000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 64930000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": -49770000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": -175991000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": -317920000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": -183017000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 63931000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": -17546000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 110568000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 61926000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": -84058000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2009-05-01",
          "end": "2010-04-30",
          "val": 39092000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": -26869000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": -50716000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 120209000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": -160094000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": -267225000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": -164965000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 7007000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 80112000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 224160000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 134252000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": -176407000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": -121834000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": -134142000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": -128265000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 11684000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2009-05-01",
          "end": "2010-04-30",
          "val": -78957000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-12-31",
          "val": -649678000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "unit": "USD"
        },
        {
          "end": "2024-12-31",
          "val": -615242000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024Q4I",
          "unit": "USD"
        },
        {
          "end": "2023-12-31",
          "val": -548273000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2023Q4I",
          "unit": "USD"
        },
        {
          "end": "2022-12-31",
          "val": -539422000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2022Q4I",
          "unit": "USD"
        },
        {
          "end": "2021-12-31",
          "val": -474318000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2021Q4I",
          "unit": "USD"
        },
        {
          "end": "2020-12-31",
          "val": -427681000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": -390196000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": -429048000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-04-30",
          "val": -395669000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q1I",
          "unit": "USD"
        },
        {
          "end": "2017-04-30",
          "val": -466541000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "end": "2016-04-30",
          "val": -442000000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2016Q1I",
          "unit": "USD"
        },
        {
          "end": "2015-04-30",
          "val": -438432000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2015Q1I",
          "unit": "USD"
        },
        {
          "end": "2014-04-30",
          "val": -389758000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "end": "2013-04-30",
          "val": -310341000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2013Q1I",
          "unit": "USD"
        },
        {
          "end": "2012-04-30",
          "val": -278377000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "end": "2011-04-30",
          "val": -237563000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 16728000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "shares"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": 15504000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "shares"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 14994000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "shares"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 15216000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "shares"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 13803000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "shares"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 12564000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "shares"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 11744000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "shares"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 11998000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 12117000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 123094000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "shares"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 118004000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": 105331000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 93344000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "shares"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 83557000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 78628,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 16775000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "shares"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": 15504000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "shares"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 17118000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "shares"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 15216000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "shares"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 13803000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "shares"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 12564000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "shares"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 13182000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "shares"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 13460000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 13730000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 137372000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "shares"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 134598000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": 127028000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 114535000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "shares"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 103432000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 98782,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 1.02,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD/shares"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": -1.27,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD/shares"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 2.33,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD/shares"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": -1.35,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD/shares"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": -0.47,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD/shares"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": -0.15,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD/shares"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 6.06,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD/shares"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 8.71,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 2.58,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 1.02,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD/shares"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": -1.27,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD/shares"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 2.32,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD/shares"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": -1.35,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD/shares"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": -0.47,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD/shares"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": -0.15,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD/shares"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 6,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD/shares"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 8.71,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 2.58,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD/shares"
        }
      ]
    },
    {
      "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": "2025-12-31",
          "val": 526000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025Q4I",
          "unit": "USD"
        },
        {
          "end": "2024-12-31",
          "val": 2543000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024Q4I",
          "unit": "USD"
        },
        {
          "end": "2023-12-31",
          "val": 2798000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2023Q4I",
          "unit": "USD"
        },
        {
          "end": "2022-12-31",
          "val": 3120000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2022Q4I",
          "unit": "USD"
        },
        {
          "end": "2021-12-31",
          "val": 3370000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2021Q4I",
          "unit": "USD"
        },
        {
          "end": "2020-12-31",
          "val": 2674000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 1277000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 686000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-04-30",
          "val": 820000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q1I",
          "unit": "USD"
        },
        {
          "end": "2017-04-30",
          "val": 901000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "end": "2016-04-30",
          "val": 1011000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2016Q1I",
          "unit": "USD"
        },
        {
          "end": "2015-04-30",
          "val": 1027000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2015Q1I",
          "unit": "USD"
        },
        {
          "end": "2014-04-30",
          "val": 1681000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "end": "2013-04-30",
          "val": 1221000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2013Q1I",
          "unit": "USD"
        },
        {
          "end": "2012-04-30",
          "val": 1454000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "end": "2011-04-30",
          "val": 1704000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 3445000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": 3014000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 3295000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 2615000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 2689000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 2106000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 1905000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 1587000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 6000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 2256000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 2215000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": 0,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 0,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 332000000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 404000000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 64537000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": 20475000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 84453000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 13861000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 29892000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 33843000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 109041000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": -23704000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": -30110000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 24256000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 44904000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": 37530000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 81083000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 69666000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 66567000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "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": "2023-01-01",
          "end": "2023-12-31",
          "val": 36429000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 32750000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 29078000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 27525000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 30537000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 34178000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 34314000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 28417000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2014-05-01",
          "end": "2015-04-30",
          "val": 34447000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-05-01",
          "end": "2014-04-30",
          "val": 33729000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 61154000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 61801000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 62735000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2009-05-01",
          "end": "2010-04-30",
          "val": 65442000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Goodwill",
      "taxonomy": "us-gaap",
      "label": "Goodwill carrying amount",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Recognized goodwill remaining after accumulated impairment. It arises from business combinations and does not measure the current value of the company’s brand.",
      "observations": [
        {
          "end": "2025-12-31",
          "val": 316000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025Q4I",
          "unit": "USD"
        },
        {
          "end": "2024-12-31",
          "val": 491000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024Q4I",
          "unit": "USD"
        },
        {
          "end": "2023-12-31",
          "val": 491000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2023Q4I",
          "unit": "USD"
        },
        {
          "end": "2022-12-31",
          "val": 866000,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2022Q4I",
          "unit": "USD"
        },
        {
          "end": "2021-12-31",
          "val": 866000,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2021Q4I",
          "unit": "USD"
        },
        {
          "end": "2020-12-31",
          "val": 986000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 1086000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 1546000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-04-30",
          "val": 1553000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2018Q1I",
          "unit": "USD"
        },
        {
          "end": "2017-04-30",
          "val": 1572000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "end": "2016-04-30",
          "val": 1680000,
          "accn": "0001558370-17-004986",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-28",
          "frame": "CY2016Q1I",
          "unit": "USD"
        },
        {
          "end": "2015-04-30",
          "val": 1718000,
          "accn": "0001558370-16-006536",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-06-29",
          "frame": "CY2015Q1I",
          "unit": "USD"
        },
        {
          "end": "2014-04-30",
          "val": 1100000,
          "accn": "0001140361-15-025776",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-06-29",
          "unit": "USD"
        },
        {
          "end": "2013-04-30",
          "val": 1106000,
          "accn": "0000798359-14-000048",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-06-30",
          "frame": "CY2013Q1I",
          "unit": "USD"
        },
        {
          "end": "2012-04-30",
          "val": 1120000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "end": "2011-04-30",
          "val": 1127000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "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": "2025-01-01",
          "end": "2025-12-31",
          "val": 3454000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2025",
          "unit": "USD"
        },
        {
          "start": "2024-01-01",
          "end": "2024-12-31",
          "val": 4703000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2024",
          "unit": "USD"
        },
        {
          "start": "2023-01-01",
          "end": "2023-12-31",
          "val": 11539000,
          "accn": "0000798359-26-000014",
          "fy": 2025,
          "fp": "FY",
          "form": "10-K",
          "filed": "2026-02-17",
          "frame": "CY2023",
          "unit": "USD"
        },
        {
          "start": "2022-01-01",
          "end": "2022-12-31",
          "val": 29059000,
          "accn": "0000798359-25-000011",
          "fy": 2024,
          "fp": "FY",
          "form": "10-K",
          "filed": "2025-02-18",
          "frame": "CY2022",
          "unit": "USD"
        },
        {
          "start": "2021-01-01",
          "end": "2021-12-31",
          "val": 0,
          "accn": "0000798359-24-000019",
          "fy": 2023,
          "fp": "FY",
          "form": "10-K",
          "filed": "2024-02-20",
          "frame": "CY2021",
          "unit": "USD"
        },
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 0,
          "accn": "0000798359-23-000013",
          "fy": 2022,
          "fp": "FY",
          "form": "10-K",
          "filed": "2023-02-21",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 18023000,
          "accn": "0000798359-22-000035",
          "fy": 2021,
          "fp": "FY",
          "form": "10-K",
          "filed": "2022-02-28",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2017-05-01",
          "end": "2018-04-30",
          "val": 9935000,
          "accn": "0001628280-21-002665",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-22",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-05-01",
          "end": "2017-04-30",
          "val": 4501000,
          "accn": "0001628280-20-001795",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-19",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-05-01",
          "end": "2016-04-30",
          "val": 35000000,
          "accn": "0001628280-18-008587",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-06-28",
          "unit": "USD"
        },
        {
          "start": "2012-05-01",
          "end": "2013-04-30",
          "val": 15000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2011-05-01",
          "end": "2012-04-30",
          "val": 14000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2010-05-01",
          "end": "2011-04-30",
          "val": 10000,
          "accn": "0000798359-13-000065",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-07-01",
          "unit": "USD"
        },
        {
          "start": "2009-05-01",
          "end": "2010-04-30",
          "val": 11000,
          "accn": "0000798359-12-000073",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-07-16",
          "unit": "USD"
        }
      ]
    }
  ],
  "source_snapshot": "/company-data/sources/42673dfcc9aa24e35b23cf24ce84f3626291f85d1ad3e1952af1e6e444ab6fcd.json.gz"
}
