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Fair Value Measurements - Additional Information (Detail) (USD $)
Jan. 31, 2015
Feb. 01, 2014
Debt Instrument [Line Items]    
Fair value measurements outstanding under revolving line of credit $ 9,800,000us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding  
Outstanding loan amount 12,000,000us-gaap_LongTermDebt  
Outstanding under the related party debt 533,000us-gaap_NotesPayableRelatedPartiesNoncurrent 567,000us-gaap_NotesPayableRelatedPartiesNoncurrent
Bonds [Member]    
Debt Instrument [Line Items]    
Fair value measurements outstanding under Bond 3,700,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
 
PGP Florence, LLC [Member] | Fair Value, Inputs, Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of commercial real estate debt 12,000,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ dei_LegalEntityAxis
= bamm_PGPFlorenceLLCMember
 
PGP Florence, LLC [Member] | Loans Payable [Member]    
Debt Instrument [Line Items]    
Outstanding loan amount 12,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= bamm_PGPFlorenceLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
PGP Gardendale, LLC [Member] | Fair Value, Inputs, Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of commercial real estate debt 4,900,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ dei_LegalEntityAxis
= bamm_PGPGardendaleLLCMember
 
PGP Gardendale, LLC [Member] | Loans Payable [Member]    
Debt Instrument [Line Items]    
Outstanding loan amount 5,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= bamm_PGPGardendaleLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
PGP Fayetteville, LLC [Member] | Fair Value, Inputs, Level 2 [Member]    
Debt Instrument [Line Items]    
Fair value of commercial real estate debt 3,300,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ dei_LegalEntityAxis
= bamm_PGPFayettevilleLLCMember
 
PGP Fayetteville, LLC [Member] | Loans Payable [Member]    
Debt Instrument [Line Items]    
Outstanding loan amount $ 3,100,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= bamm_PGPFayettevilleLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember