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Subsequent Events (Details) (Subsequent Event, Cerberus, USD $) In Millions, unless otherwise specified	0 Months Ended
	Jan. 10, 2013
Subsequent Event | Cerberus
Subsequent Event [Line Items]
Offering of common stock to stockholders via the rights offering	$ 40
Approximate gross proceeds from fully subscribed rights offering of common stock	$ 40

X

- Definition

Gross proceeds from rights offering.

+ References

No definition available.

+ Details

Name:	bxc_GrossProceedsFromRightsOffering
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum amount of common stock offered under rights offering.

+ References

No definition available.

+ Details

Name:	bxc_MaximumAmountOfCommonStockOfferedUnderRightsOffering
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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