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Stockholder's Equity (Dividends) (Details) (USD $)
 12 Months Ended
Mar. 31, 2015
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 31, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 31, 2013
Dec. 29, 2012
Sep. 29, 2012
Jun. 30, 2012
Stockholders' Equity Note [Abstract]                        
Dividends, rate (per share) $ 0.10us-gaap_DividendsPayableAmountPerShare $ 0.10us-gaap_DividendsPayableAmountPerShare $ 0.10us-gaap_DividendsPayableAmountPerShare $ 0.10us-gaap_DividendsPayableAmountPerShare $ 0.09us-gaap_DividendsPayableAmountPerShare $ 0.09us-gaap_DividendsPayableAmountPerShare $ 0.09us-gaap_DividendsPayableAmountPerShare $ 0.09us-gaap_DividendsPayableAmountPerShare $ 0.08us-gaap_DividendsPayableAmountPerShare $ 0.08us-gaap_DividendsPayableAmountPerShare $ 0.08us-gaap_DividendsPayableAmountPerShare $ 0.08us-gaap_DividendsPayableAmountPerShare
Dividends, aggregate value $ 1,537,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,536,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,544,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,554,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,400,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,410,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,430,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,445,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,291,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,304,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,323,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 1,355,000us-gaap_DividendsPayableCurrentAndNoncurrent
Maximum regular quarterly dividends per year permitted under credit agreement $ 15,000bbox_DebtInstrumentCovenantMaximumQuarterlyDividendsPerYear