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INCOME TAXES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
May 02, 2015
May 03, 2014
Jan. 31, 2015
Income Taxes      
Deferred tax asset valuation allowance $ 175,356us-gaap_DeferredTaxAssetsValuationAllowance $ 156,846us-gaap_DeferredTaxAssetsValuationAllowance $ 161,856us-gaap_DeferredTaxAssetsValuationAllowance
Income tax (benefit) provision (159)us-gaap_IncomeTaxExpenseBenefit 448us-gaap_IncomeTaxExpenseBenefit  
Non-cash income tax benefit from continuing operations 609bont_IncomeTaxExpenseBenefitResultingFromOciAllocation    
Recognition of deferred tax liabilities associated with indefinite-lived assets $ 450bont_DeferredIncomeTaxExpenseBenefitAssociatedWithIndefiniteLivedAssets