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        "label": "Debt Securities, Available-for-sale, Amortized Cost",
        "description": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "units": {
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              "end": "2014-02-01",
              "val": 19227000,
              "accn": "0000745732-15-000009",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-31",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 6930000,
              "accn": "0000745732-15-000009",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-31",
              "frame": "CY2014Q4I"
            }
          ]
        }
      },
      "AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax": {
        "label": "Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax (Deprecated 2018-01-31)",
        "description": "The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.",
        "units": {
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              "form": "10-Q",
              "filed": "2010-09-08"
            },
            {
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              "end": "2009-08-01",
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              "accn": "0001206774-10-001976",
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              "fp": "Q2",
              "form": "10-Q",
              "filed": "2010-09-08",
              "frame": "CY2009Q2"
            },
            {
              "start": "2009-02-01",
              "end": "2009-10-31",
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              "accn": "0001206774-10-002589",
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              "form": "10-Q/A",
              "filed": "2010-12-08"
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            {
              "start": "2009-02-01",
              "end": "2009-10-31",
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              "form": "10-Q",
              "filed": "2010-12-08"
            },
            {
              "start": "2009-08-02",
              "end": "2009-10-31",
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              "accn": "0001206774-10-002589",
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            {
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              "accn": "0001206774-10-002571",
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            {
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              "accn": "0001206774-11-001349",
              "fy": 2011,
              "fp": "Q1",
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            {
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              "accn": "0001206774-11-002035",
              "fy": 2011,
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              "fy": 2010,
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              "end": "2010-07-31",
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            {
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              "accn": "0001206774-10-002589",
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            {
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              "end": "2010-10-30",
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              "accn": "0001206774-10-002571",
              "fy": 2010,
              "fp": "Q3",
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              "filed": "2010-12-08"
            },
            {
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              "end": "2010-10-30",
              "val": 137000,
              "accn": "0001206774-11-002790",
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              "form": "10-Q",
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            {
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              "accn": "0001206774-10-002589",
              "fy": 2010,
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              "filed": "2010-12-08"
            },
            {
              "start": "2010-08-01",
              "end": "2010-10-30",
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              "accn": "0001206774-10-002571",
              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-12-08"
            },
            {
              "start": "2011-01-30",
              "end": "2011-04-30",
              "val": -3000,
              "accn": "0001206774-11-001349",
              "fy": 2011,
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              "form": "10-Q",
              "filed": "2011-06-08",
              "frame": "CY2011Q1"
            },
            {
              "start": "2011-01-30",
              "end": "2011-07-30",
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              "accn": "0001206774-11-002035",
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              "fp": "Q2",
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              "filed": "2011-09-07"
            },
            {
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              "end": "2011-07-30",
              "val": 86000,
              "accn": "0001206774-11-002035",
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            },
            {
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              "end": "2011-10-29",
              "val": 47000,
              "accn": "0001206774-11-002790",
              "fy": 2011,
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              "form": "10-Q",
              "filed": "2011-12-07"
            },
            {
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              "accn": "0001206774-11-002790",
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          ]
        }
      },
      "AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses": {
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss (Deprecated 2018-01-31)",
        "description": "Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.",
        "units": {
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              "end": "2010-07-31",
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              "accn": "0001206774-10-001976",
              "fy": 2010,
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          ]
        }
      },
      "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost": {
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        "description": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "units": {
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              "end": "2010-07-31",
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              "accn": "0001206774-10-001976",
              "fy": 2010,
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              "filed": "2010-09-08",
              "frame": "CY2010Q2I"
            },
            {
              "end": "2010-10-30",
              "val": 6948000,
              "accn": "0001206774-10-002589",
              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q/A",
              "filed": "2010-12-08",
              "frame": "CY2010Q3I"
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            {
              "end": "2010-10-30",
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              "fy": 2010,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2010-12-08"
            },
            {
              "end": "2011-01-29",
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              "accn": "0001206774-11-000627",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-29",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-04-30",
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          ]
        }
      },
      "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue": {
        "label": "Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10",
        "description": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "units": {
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              "accn": "0001206774-10-002589",
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            {
              "end": "2011-01-29",
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              "filed": "2011-03-29",
              "frame": "CY2010Q4I"
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            {
              "end": "2011-04-30",
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          ]
        }
      },
      "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost": {
        "label": "Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five",
        "description": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "units": {
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          ]
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      },
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          ]
        }
      },
      "AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost": {
        "label": "Available-for-sale Securities, Debt Maturities, Amortized Cost Basis (Deprecated 2014-01-31)",
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              "form": "10-Q",
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              "frame": "CY2011Q3I"
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            {
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              "accn": "0001206774-11-002790",
              "fy": 2011,
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            {
              "end": "2012-01-28",
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            },
            {
              "end": "2012-01-28",
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            {
              "end": "2012-01-28",
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            {
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            {
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            {
              "end": "2012-07-28",
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            {
              "end": "2013-02-02",
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              "frame": "CY2012Q4I"
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            {
              "end": "2013-02-02",
              "val": 10099000,
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            {
              "end": "2013-02-02",
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            {
              "end": "2013-11-02",
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              "end": "2014-02-01",
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      },
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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              "form": "10-Q",
              "filed": "2013-09-11",
              "frame": "CY2013Q2I"
            },
            {
              "end": "2013-11-02",
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              "fy": 2013,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2013-12-11",
              "frame": "CY2013Q3I"
            },
            {
              "end": "2014-02-01",
              "val": 19825000,
              "accn": "0000745732-14-000006",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-04-01"
            },
            {
              "end": "2014-02-01",
              "val": 19825000,
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              "fy": 2014,
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              "filed": "2015-03-31",
              "frame": "CY2013Q4I"
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            {
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              "accn": "0000745732-15-000009",
              "fy": 2014,
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              "form": "10-K",
              "filed": "2015-03-31",
              "frame": "CY2014Q4I"
            }
          ]
        }
      },
      "AvailableForSaleSecuritiesDebtSecuritiesCurrent": {
        "label": "Debt Securities, Available-for-sale, Current",
        "description": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.",
        "units": {
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            {
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      },
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        "label": "Available-for-sale Securities, Gross Unrealized Losses (Deprecated 2013-01-31)",
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      "AvailableforsaleSecuritiesGrossUnrealizedGain": {
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              "val": 387536000,
              "accn": "0000745732-13-000006",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-04-02",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2014-02-01",
              "val": 417443000,
              "accn": "0000745732-14-000006",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-04-01",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2015-01-31",
              "val": 438423000,
              "accn": "0000745732-15-000009",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-31",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-30",
              "val": 465085000,
              "accn": "0000745732-16-000037",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-03-29",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2017-01-28",
              "val": 490936000,
              "accn": "0000745732-17-000009",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-28",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2018-02-03",
              "val": 516372000,
              "accn": "0000745732-18-000004",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-04-03",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2019-02-02",
              "val": 555812000,
              "accn": "0000745732-19-000009",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-04-02"
            },
            {
              "end": "2019-02-02",
              "val": 555812000,
              "accn": "0000745732-19-000030",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-12"
            },
            {
              "end": "2019-02-02",
              "val": 555812000,
              "accn": "0000745732-19-000037",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-09-11"
            },
            {
              "end": "2019-02-02",
              "val": 555812000,
              "accn": "0000745732-19-000045",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-12-11",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2020-02-01",
              "val": 555812000,
              "accn": "0000745732-20-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-03-31",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInFiveYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Five Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
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              "end": "2011-01-29",
              "val": 217168000,
              "accn": "0001206774-11-000627",
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              "form": "10-K",
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            },
            {
              "end": "2012-01-28",
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              "fy": 2011,
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              "form": "10-K",
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              "frame": "CY2011Q4I"
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            {
              "end": "2013-02-02",
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              "accn": "0000745732-13-000006",
              "fy": 2012,
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              "filed": "2014-04-01",
              "frame": "CY2013Q4I"
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            {
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              "accn": "0000745732-15-000009",
              "fy": 2014,
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            {
              "end": "2016-01-30",
              "val": 265830000,
              "accn": "0000745732-16-000037",
              "fy": 2015,
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              "filed": "2016-03-29",
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              "end": "2017-01-28",
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              "accn": "0000745732-17-000009",
              "fy": 2016,
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              "accn": "0000745732-18-000004",
              "fy": 2017,
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              "filed": "2018-04-03",
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              "end": "2019-02-02",
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              "fp": "FY",
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              "filed": "2019-04-02"
            },
            {
              "end": "2019-02-02",
              "val": 339340000,
              "accn": "0000745732-19-000030",
              "fy": 2019,
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              "filed": "2019-06-12"
            },
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              "end": "2019-02-02",
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              "accn": "0000745732-19-000037",
              "fy": 2019,
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            },
            {
              "end": "2019-02-02",
              "val": 339340000,
              "accn": "0000745732-19-000045",
              "fy": 2019,
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              "form": "10-Q",
              "filed": "2019-12-11",
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            {
              "end": "2020-02-01",
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              "fy": 2019,
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              "filed": "2020-03-31",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
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              "accn": "0001206774-11-000627",
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              "filed": "2012-03-27",
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              "accn": "0000745732-13-000006",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
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              "filed": "2014-04-01",
              "frame": "CY2013Q4I"
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            {
              "end": "2016-01-30",
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              "accn": "0000745732-16-000037",
              "fy": 2015,
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              "form": "10-K",
              "filed": "2016-03-29",
              "frame": "CY2015Q4I"
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              "end": "2017-01-28",
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              "accn": "0000745732-17-000009",
              "fy": 2016,
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            {
              "end": "2018-02-03",
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              "accn": "0000745732-18-000004",
              "fy": 2017,
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              "filed": "2018-04-03",
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            },
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              "end": "2019-02-02",
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              "fp": "FY",
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              "filed": "2019-04-02"
            },
            {
              "end": "2019-02-02",
              "val": 424695000,
              "accn": "0000745732-19-000030",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-06-12"
            },
            {
              "end": "2019-02-02",
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              "accn": "0000745732-19-000037",
              "fy": 2019,
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              "form": "10-Q",
              "filed": "2019-09-11"
            },
            {
              "end": "2019-02-02",
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              "accn": "0000745732-19-000045",
              "fy": 2019,
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              "form": "10-Q",
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              "end": "2020-02-01",
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              "fy": 2019,
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              "filed": "2020-03-31",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
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              "accn": "0000745732-14-000006",
              "fy": 2013,
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              "form": "10-K",
              "filed": "2014-04-01",
              "frame": "CY2013Q4I"
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              "accn": "0000745732-16-000037",
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              "filed": "2016-03-29",
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              "end": "2017-01-28",
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              "accn": "0000745732-17-000009",
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              "frame": "CY2016Q4I"
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            {
              "end": "2018-02-03",
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              "accn": "0000745732-18-000004",
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              "form": "10-K",
              "filed": "2018-04-03",
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            },
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              "end": "2019-02-02",
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              "accn": "0000745732-19-000009",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-04-02"
            },
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              "end": "2019-02-02",
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              "accn": "0000745732-19-000030",
              "fy": 2019,
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              "form": "10-Q",
              "filed": "2019-06-12"
            },
            {
              "end": "2019-02-02",
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              "accn": "0000745732-19-000037",
              "fy": 2019,
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              "form": "10-Q",
              "filed": "2019-09-11"
            },
            {
              "end": "2019-02-02",
              "val": 499678000,
              "accn": "0000745732-19-000045",
              "fy": 2019,
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              "form": "10-Q",
              "filed": "2019-12-11",
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            },
            {
              "end": "2020-02-01",
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              "accn": "0000745732-20-000016",
              "fy": 2019,
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              "filed": "2020-03-31",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
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        "label": "Operating Leases, Future Minimum Payments, Due in Two Years",
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              "val": 361351000,
              "accn": "0001206774-11-000627",
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              "accn": "0001206774-12-001210",
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              "filed": "2012-03-27",
              "frame": "CY2011Q4I"
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              "accn": "0000745732-13-000006",
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              "filed": "2013-04-02",
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              "accn": "0000745732-14-000006",
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              "fp": "FY",
              "form": "10-K",
              "filed": "2014-04-01",
              "frame": "CY2013Q4I"
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              "accn": "0000745732-15-000009",
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              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-31",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2016-01-30",
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              "accn": "0000745732-16-000037",
              "fy": 2015,
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              "form": "10-K",
              "filed": "2016-03-29",
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            {
              "end": "2018-02-03",
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              "accn": "0000745732-18-000004",
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              "filed": "2018-04-03",
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              "filed": "2019-04-02"
            },
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              "fy": 2019,
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              "form": "10-Q",
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              "form": "10-Q",
              "filed": "2019-12-11",
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              "filed": "2020-03-31",
              "frame": "CY2019Q4I"
            }
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        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueThereafter": {
        "label": "Operating Leases, Future Minimum Payments, Due Thereafter",
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              "filed": "2014-04-01",
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              "accn": "0000745732-16-000037",
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              "form": "10-K",
              "filed": "2016-03-29",
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              "filed": "2017-03-28",
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            },
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              "end": "2018-02-03",
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              "accn": "0000745732-18-000004",
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              "filed": "2018-04-03",
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              "end": "2019-02-02",
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              "fy": 2018,
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              "filed": "2019-04-02"
            },
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              "end": "2019-02-02",
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              "accn": "0000745732-19-000030",
              "fy": 2019,
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              "form": "10-Q",
              "filed": "2019-06-12"
            },
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              "end": "2019-02-02",
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              "accn": "0000745732-19-000037",
              "fy": 2019,
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              "form": "10-Q",
              "filed": "2019-09-11"
            },
            {
              "end": "2019-02-02",
              "val": 1575673000,
              "accn": "0000745732-19-000045",
              "fy": 2019,
              "fp": "Q3",
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              "accn": "0000745732-17-000030",
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        }
      },
      "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant",
        "description": "The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.",
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      "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period",
        "description": "The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.",
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