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Fair Value Measurements (Detail Textuals) (USD $) In Millions, unless otherwise specified	Dec. 29, 2012
Discounted carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Value of mortgage	$ 202.7
Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Value of mortgage	$ 202.2

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- Definition

Mortgage loan fair value disclosure.

+ References

No definition available.

+ Details

Name:	bxc_MortgageLoanFairValueDisclosure
Namespace Prefix:	bxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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