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An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.","units":{"USD":[{"end":"2011-01-29","val":5606000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18","frame":"CY2010Q4I"},{"end":"2012-01-28","val":5875000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17","frame":"CY2011Q4I"},{"end":"2012-01-28","val":5875000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18"},{"end":"2013-02-02","val":5963000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2012Q4I"},{"end":"2013-02-02","val":5963000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17"},{"end":"2013-02-02","val":5963000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18"},{"end":"2014-02-01","val":6243000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2013Q4I"},{"end":"2014-02-01","val":6243000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17"},{"end":"2015-01-31","val":5924000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2014Q4I"}]}},"AssetRetirementObligationAccretionExpense":{"label":"Asset Retirement Obligation, Accretion Expense","description":"Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.","units":{"USD":[{"start":"2011-01-30","end":"2012-01-28","val":-323000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18","frame":"CY2011"},{"start":"2012-01-29","end":"2013-02-02","val":-298000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17","frame":"CY2012"},{"start":"2012-01-29","end":"2013-02-02","val":-298000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18"},{"start":"2013-02-03","end":"2014-02-01","val":-334000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2013"},{"start":"2013-02-03","end":"2014-02-01","val":-334000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17"},{"start":"2014-02-02","end":"2015-01-31","val":-350000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2014"}]}},"AssetRetirementObligationLiabilitiesIncurred":{"label":"Asset Retirement Obligation, Liabilities Incurred","description":"Amount of asset retirement obligations incurred during the period.","units":{"USD":[{"start":"2011-01-30","end":"2012-01-28","val":206000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18","frame":"CY2011"},{"start":"2012-01-29","end":"2013-02-02","val":89000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17","frame":"CY2012"},{"start":"2012-01-29","end":"2013-02-02","val":89000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18"},{"start":"2013-02-03","end":"2014-02-01","val":245000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2013"},{"start":"2013-02-03","end":"2014-02-01","val":245000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17"},{"start":"2014-02-02","end":"2015-01-31","val":113000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2014"}]}},"AssetRetirementObligationLiabilitiesSettled":{"label":"Asset Retirement Obligation, Liabilities Settled","description":"Amount of asset retirement obligations settled, or otherwise disposed of, during the period. 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These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the 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This item includes treasury stock repurchased by the entity. 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Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.","units":{"USD":[{"end":"2012-01-28","val":293600000,"accn":"0001104659-12-061848","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-09-06"},{"end":"2012-01-28","val":293600000,"accn":"0001104659-12-082383","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-12-06"},{"end":"2012-01-28","val":293600000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18","frame":"CY2011Q4I"},{"end":"2012-07-28","val":296600000,"accn":"0001104659-12-061848","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-09-06","frame":"CY2012Q2I"},{"end":"2012-10-27","val":201500000,"accn":"0001104659-12-082383","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-12-06","frame":"CY2012Q3I"},{"end":"2013-02-02","val":203500000,"accn":"0001047469-13-004524","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-18"},{"end":"2013-02-02","val":203500000,"accn":"0001104659-13-048295","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-06-11"},{"end":"2013-02-02","val":203500000,"accn":"0001104659-13-068997","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-09-10"},{"end":"2013-02-02","val":203500000,"accn":"0001104659-13-089584","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-12-11"},{"end":"2013-02-02","val":203500000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17","frame":"CY2012Q4I"},{"end":"2013-05-04","val":202200000,"accn":"0001104659-13-048295","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-06-11","frame":"CY2013Q1I"},{"end":"2013-08-03","val":200200000,"accn":"0001104659-13-068997","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-09-10","frame":"CY2013Q2I"},{"end":"2013-11-02","val":199500000,"accn":"0001104659-13-089584","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-12-11","frame":"CY2013Q3I"},{"end":"2014-02-01","val":203700000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17"},{"end":"2014-02-01","val":203700000,"accn":"0001104659-14-045093","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-06-10"},{"end":"2014-02-01","val":203700000,"accn":"0001104659-14-065496","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-09-10"},{"end":"2014-02-01","val":203700000,"accn":"0001104659-14-085681","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-12-09"},{"end":"2014-02-01","val":203700000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2013Q4I"},{"end":"2014-05-03","val":205200000,"accn":"0001104659-14-045093","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-06-10","frame":"CY2014Q1I"},{"end":"2014-08-02","val":222000000,"accn":"0001104659-14-065496","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-09-10","frame":"CY2014Q2I"},{"end":"2014-11-01","val":230000000,"accn":"0001104659-14-085681","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-12-09","frame":"CY2014Q3I"},{"end":"2015-01-31","val":211000000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16"},{"end":"2015-01-31","val":211000000,"accn":"0001104659-15-044479","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-06-10"},{"end":"2015-01-31","val":211000000,"accn":"0001104659-15-064443","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-09-10"},{"end":"2015-01-31","val":211000000,"accn":"0001104659-15-083662","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-12-08","frame":"CY2014Q4I"},{"end":"2015-05-02","val":195500000,"accn":"0001104659-15-044479","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-06-10","frame":"CY2015Q1I"},{"end":"2015-08-01","val":195000000,"accn":"0001104659-15-064443","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-09-10","frame":"CY2015Q2I"},{"end":"2015-10-31","val":194500000,"accn":"0001104659-15-083662","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-12-08","frame":"CY2015Q3I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","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 next 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":"2014-02-01","val":2000000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17","frame":"CY2013Q4I"},{"end":"2015-01-31","val":2000000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","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 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":{"USD":[{"end":"2014-02-01","val":190000000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","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 fourth 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":"2014-02-01","val":2000000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17","frame":"CY2013Q4I"},{"end":"2015-01-31","val":190000000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2014Q4I"}]}},"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":"2014-02-01","val":5500000,"accn":"0001047469-14-003889","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-17","frame":"CY2013Q4I"},{"end":"2015-01-31","val":2000000,"accn":"0001047469-15-003559","fy":2014,"fp":"FY","form":"10-K","filed":"2015-04-16","frame":"CY2014Q4I"}]}},"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. 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A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the 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