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Summary of Significant Accounting Policies (Parentheticals) (Details 1)	9 Months Ended
	Sep. 28, 2013 Factor
Summary Of Significant Accounting Policies [Abstract]
Adjustment factor used to adjust weighted average shares for the bonus element in the rights offering	1.0894

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- Definition

Represents adjustment factor used to adjust weighted average shares for the bonus element in the rights offering.

+ References

No definition available.

+ Details

Name:	bxc_CalculationFactorForBasicAndDilutedEarningsPerShareInPriorPeriods
Namespace Prefix:	bxc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration