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Summary of Significant Accounting Policies (Detail Textuals 3) (Long-Term Incentive Plan 2006, Performance Shares)	12 Months Ended
	Jan. 03, 2009
Long-Term Incentive Plan 2006 | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares granted	834,071

X

- Definition

These awards are liability awards paid out in cash, granted during 2008 and paid out in 2011.

+ References

No definition available.

+ Details

Name:	bxc_PerformanceSharesVestedAsLiabilityAwards
Namespace Prefix:	bxc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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