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Income Taxes - Summary of Income Tax Provision (Benefit) Included Financial Statements (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Income Tax Disclosure [Abstract]    
Continuing Operations $ (242)us-gaap_IncomeTaxExpenseBenefit $ 4,832us-gaap_IncomeTaxExpenseBenefit
Discontinued Operations 0us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod (66)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Provision for income taxes $ (242)bamm_IncomeTaxProvisionIncludingDiscontinuedOperation $ 4,766bamm_IncomeTaxProvisionIncludingDiscontinuedOperation