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Summary of Significant Accounting Policies (Detail Textuals 3) (Long-Term Incentive Plan 2006, Performance Shares)	12 Months Ended
	Jan. 04, 2014
Long-Term Incentive Plan 2006 | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares granted and approved during the period	2,969,424
Performance shares expected to vest	2,192,868

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested and expected to vest.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of performance shares granted during the period that will vest upon successful achievement of certain financial and strategic goals approved by the Compensation Committee.

+ References

No definition available.

+ Details

Name:	bxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsPerformanceSharesGranted
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