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Business Segments - Summary of Sales by Merchandise Category Related to Retail Trade and Electronic Commerce Trade Segments (Detail)
 3 Months Ended
May 02, 2015
May 03, 2014
Revenue from External Customer [Line Items]    
Percentage of total net sales 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Books and magazines [Member]    
Revenue from External Customer [Line Items]    
Percentage of total net sales 68.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_BooksAndMagazinesMember		 70.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_BooksAndMagazinesMember
General Merchandise [Member]    
Revenue from External Customer [Line Items]    
Percentage of total net sales 15.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_GeneralMerchandiseMember		 12.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_GeneralMerchandiseMember
Cafe and yogurt [Member]    
Revenue from External Customer [Line Items]    
Percentage of total net sales 5.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_CafeMember		 5.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_CafeMember
Electronics, eBooks and Accessories [Member]    
Revenue from External Customer [Line Items]    
Percentage of total net sales 1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_ElectronicsEbooksAndAccessoriesMember		 1.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_ElectronicsEbooksAndAccessoriesMember
Media [Member]    
Revenue from External Customer [Line Items]    
Percentage of total net sales 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_MediaMember		 4.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= bamm_MediaMember
Other [Member]    
Revenue from External Customer [Line Items]    
Percentage of total net sales 5.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= us-gaap_AllOtherSegmentsMember		 4.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ProductOrServiceAxis
= us-gaap_AllOtherSegmentsMember