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Business Segments - Sales as a Percentage of Net Sales by Merchandise Category (Detail) (Sales [Member])
 12 Months Ended
Jan. 31, 2015
Feb. 01, 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 69.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_BooksAndMagazinesMember		 70.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_BooksAndMagazinesMember
General Merchandise [Member]
    
Revenue from External Customer [Line Items]    
Percentage of total net sales 15.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_GeneralMerchandiseMember		 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_GeneralMerchandiseMember
Cafe and Yogurt [Member]
    
Revenue from External Customer [Line Items]    
Percentage of total net sales 5.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_CafeAndYogurtMember		 4.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_CafeAndYogurtMember
Electronics, eBooks and Accessories [Member]
    
Revenue from External Customer [Line Items]    
Percentage of total net sales 1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_ElectronicsEbooksAndAccessoriesMember		 1.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_ElectronicsEbooksAndAccessoriesMember
Media [Member]
    
Revenue from External Customer [Line Items]    
Percentage of total net sales 4.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_MediaMember		 3.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_MediaMember
Other [Member]
    
Revenue from External Customer [Line Items]    
Percentage of total net sales 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_OtherProductsAndServiceMember		 5.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ProductOrServiceAxis
= bamm_OtherProductsAndServiceMember