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Equity Method Investments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
May 02, 2015
Country
Jan. 31, 2015
Apr. 30, 2013
Schedule Of Results Related To Equity Accounted Investees [Line Items]      
Acquired the equity interest 2,231us-gaap_EquityMethodInvestments $ 2,194us-gaap_EquityMethodInvestments  
IF [Member]      
Schedule Of Results Related To Equity Accounted Investees [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
Equity Interest One [Member] | IF [Member] | Anco Far East [Member]      
Schedule Of Results Related To Equity Accounted Investees [Line Items]      
Percentage of equity method investment in company 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionAxis
= bamm_EquityInterestOneMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bamm_AncoFarEastMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bamm_IfMember		    
Equity Interest Two [Member] | IF [Member] | Principals of IF [Member]      
Schedule Of Results Related To Equity Accounted Investees [Line Items]      
Percentage of equity method investment in company 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionAxis
= bamm_EquityInterestTwoMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bamm_PrincipalsofIFMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bamm_IfMember