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Summary of Significant Accounting Policies (Detail Textuals 4) (Restructuring plan 2013)	9 Months Ended
	Sep. 28, 2013 Facility
Restructuring plan 2013
Restructuring Cost and Reserve [Line Items]
Number of facilities closed for which lease reserves were recorded	2

X

- Definition

Number of facilities closed for which lease reserves were recorded.

+ References

No definition available.

+ Details

Name:	bxc_FacilitiesClosedWithLeaseReserves
Namespace Prefix:	bxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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