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Related Party Transactions (Details) (Agreement, Cerberus, USD $) In Millions, unless otherwise specified	Dec. 29, 2012
Agreement | Cerberus
Related Party Transaction [Line Items]
Amount of common stock offered under rights offering	$ 40

X

- Definition

Represents the amount of common stock offered under rights offering.

+ References

No definition available.

+ Details

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

X

- Details

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