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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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Per Share, Basic and Diluted","description":"The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. 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Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2012-01-31","val":7000000,"accn":"0001193125-13-147360","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-09","frame":"CY2011Q4I"},{"end":"2012-01-31","val":7000000,"accn":"0001193125-12-490586","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-12-04"},{"end":"2012-01-31","val":7000000,"accn":"0001193125-12-390894","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-09-13"},{"end":"2012-07-31","val":0,"accn":"0001193125-12-390894","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-09-13","frame":"CY2012Q2I"}]}},"LongTermDebt":{"label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-01-31","val":863000,"accn":"0001193125-13-147360","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-09","frame":"CY2012Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third 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":{"USD":[{"end":"2013-01-31","val":2017000,"accn":"0001193125-13-147360","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-09","frame":"CY2012Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second 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":{"USD":[{"end":"2013-01-31","val":2469000,"accn":"0001193125-13-147360","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-09","frame":"CY2012Q4I"}]}},"LongTermDebtNoncurrent":{"label":"Long-term Debt, Excluding Current Maturities","description":"Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2012-01-31","val":3221000,"accn":"0001193125-13-147360","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-09","frame":"CY2011Q4I"},{"end":"2012-01-31","val":3221000,"accn":"0001193125-12-490586","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-12-04"},{"end":"2012-01-31","val":3221000,"accn":"0001193125-12-390894","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-09-13"},{"end":"2012-07-31","val":6205000,"accn":"0001193125-12-390894","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-09-13","frame":"CY2012Q2I"},{"end":"2012-10-31","val":5517000,"accn":"0001193125-12-490586","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-12-04","frame":"CY2012Q3I"},{"end":"2013-01-31","val":5024000,"accn":"0001193125-14-115995","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26","frame":"CY2012Q4I"},{"end":"2013-01-31","val":5024000,"accn":"0001193125-13-468430","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-12-10"},{"end":"2013-01-31","val":5024000,"accn":"0001193125-13-357074","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-09-04"},{"end":"2013-01-31","val":5024000,"accn":"0001193125-13-248515","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-06-05"},{"end":"2013-01-31","val":5024000,"accn":"0001193125-13-147360","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-09"},{"end":"2013-04-30","val":4498000,"accn":"0001193125-13-248515","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-06-05","frame":"CY2013Q1I"}]}},"LongtermDebtPercentageBearingVariableInterestAmount":{"label":"Long-term Debt, Percentage Bearing Variable Interest, Amount","description":"The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.","units":{"USD":[{"end":"2011-01-28","val":125000,"accn":"0001193125-13-147360","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-09"},{"end":"2011-01-28","val":125000,"accn":"0001193125-13-248515","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-06-05"},{"end":"2011-01-28","val":125000,"accn":"0001193125-14-115995","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26"},{"end":"2011-01-28","val":125000,"accn":"0001193125-15-103290","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-24"},{"end":"2011-01-28","val":125000,"accn":"0001193125-16-511938","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-21","frame":"CY2010Q4I"},{"end":"2011-01-31","val":125000,"accn":"0001193125-12-490586","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-12-04"},{"end":"2012-01-28","val":125000,"accn":"0001193125-12-390894","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-09-13","frame":"CY2011Q4I"},{"end":"2012-03-30","val":87000,"accn":"0001193125-12-390894","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-09-13"},{"end":"2012-03-30","val":87000,"accn":"0001193125-12-490586","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-12-04"},{"end":"2012-03-30","val":87000,"accn":"0001193125-13-147360","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-09"},{"end":"2012-03-30","val":87000,"accn":"0001193125-13-248515","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-06-05"},{"end":"2012-03-30","val":87000,"accn":"0001193125-14-115995","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26"},{"end":"2012-03-30","val":87000,"accn":"0001193125-15-103290","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-24"},{"end":"2012-03-30","val":87000,"accn":"0001193125-16-511938","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-21","frame":"CY2012Q1I"}]}},"LossContingencyEstimateOfPossibleLoss":{"label":"Loss Contingency, Estimate of Possible Loss","description":"Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.","units":{"USD":[{"end":"2014-01-31","val":0,"accn":"0001193125-14-115995","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-26","frame":"CY2013Q4I"},{"end":"2014-04-30","val":0,"accn":"0001193125-14-217332","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-29","frame":"CY2014Q1I"}]}},"NetCashProvidedByUsedInFinancingActivities":{"label":"Net Cash Provided by (Used in) Financing Activities","description":"Amount of cash inflow (outflow) from financing activities, including discontinued operations. 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recognized for the period under subleasing 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