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Equity Method Investment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Country
Feb. 01, 2014
Apr. 30, 2013
Schedule of Equity Method Investments [Line Items]      
Acquired the equity interest 2,194us-gaap_EquityMethodInvestments $ 2,139us-gaap_EquityMethodInvestments  
IF [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of equity method investment in company 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bamm_IfMember
   
Number of countries (over) 70bamm_NumberOfCountries
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bamm_IfMember
   
Acquired the equity interest     $ 1,800us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bamm_IfMember
IF [Member] | Anco Far East [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of equity method investment by other company 45.00%bamm_EquityMethodInvestmentOwnershipPercentageByOtherCompany
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bamm_AncoFarEastMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bamm_IfMember
   
IF [Member] | Principals of the Acquired Company/IF Limited/ [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of equity method investment by other company 30.00%bamm_EquityMethodInvestmentOwnershipPercentageByOtherCompany
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bamm_PrincipalStockholderMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bamm_IfMember