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Indebtedness (Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Debt Instrument [Line Items]    
Total $ 138,132us-gaap_LongTermDebt $ 160,632us-gaap_LongTermDebt
Less: current portion (included in Other liabilities) (865)us-gaap_LongTermDebtCurrent (203)us-gaap_LongTermDebtCurrent
Long-term debt 137,267us-gaap_LongTermDebtNoncurrent 160,429us-gaap_LongTermDebtNoncurrent
Revolving credit agreement    
Debt Instrument [Line Items]    
Total 136,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
160,355us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Other    
Debt Instrument [Line Items]    
Total $ 2,132us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bbox_OtherLongTermDebtMember
$ 277us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bbox_OtherLongTermDebtMember