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Derivative Instruments and Hedging Activities (Details) (USD $)
 9 Months Ended 0 Months Ended
Dec. 27, 2014
Jul. 26, 2012
Foreign currency contracts [Member] | Derivatives designated as hedging instruments [Member] | Cash flow hedging [Member]    
Derivative [Line Items]    
Notional amount $ 59,446,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Remaining maturity 8 months  
July 2012 Interest-rate Swap [Member] | Interest rate swaps [Member] | Derivatives not designated as hedging instruments [Member]    
Derivative [Line Items]    
Notional amount   $ 125,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= bbox_July2012InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Remaining maturity   3 years
Fixed interest rate   1.25%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= bbox_July2012InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember