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Employee Benefit Plans - Summary of Unrecognized Compensation Cost Related to Non-vested Awards Granted (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total $ 1,173us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
2016 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total 781us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardDateAxis
= bamm_YearOneMember
2017 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total 320us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardDateAxis
= bamm_YearTwoMember
2018 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total $ 72us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardDateAxis
= bamm_YearThreeMember