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Variable Interest Entities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Dec. 23, 2014
Dec. 22, 2014
Jul. 19, 2013
Jul. 18, 2013
May 02, 2015
Variable Interest Entity [Line Items]          
Variable interest entity, new ownership percentage 50.10%us-gaap_VariableInterestEntityOwnershipPercentage 50.00%us-gaap_VariableInterestEntityOwnershipPercentage 50.00%us-gaap_VariableInterestEntityOwnershipPercentage 40.00%us-gaap_VariableInterestEntityOwnershipPercentage  
Variable interest entity, ownership interest held by APCP 49.90%bamm_OwnershipPercentageHeldByAffiliateInVariableInterestEntity        
Yogurt Mountain Holding LLC [Member] | Anderson Private Capital Partners I, L.P [Member]          
Variable Interest Entity [Line Items]          
Variable interest entity, investment amount         $ 3.1us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bamm_AndersonPrivateCapitalPartnersILpMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember