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Indebtedness (Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Mar. 31, 2014
Debt Instrument [Line Items]    
Debt $ 176,327us-gaap_LongTermDebt $ 160,632us-gaap_LongTermDebt
Less: current portion (included in Other liabilities) (273)us-gaap_LongTermDebtCurrent (203)us-gaap_LongTermDebtCurrent
Long-term debt 176,054us-gaap_LongTermDebtNoncurrent 160,429us-gaap_LongTermDebtNoncurrent
Revolving credit agreement [Member]    
Debt Instrument [Line Items]    
Debt 176,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
160,355us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Other [Member]    
Debt Instrument [Line Items]    
Debt $ 327us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bbox_OtherLongTermDebtMember
$ 277us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bbox_OtherLongTermDebtMember