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Fair Value Measurements (Detail Textuals) (USD $) In Millions, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Fair Value Measurements [Abstract]
Mortgage discounted carrying value	$ 205.3	$ 206.0
Mortgage fair value	$ 204.9	$ 205.5

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- Definition

Mortgage loan discounted carrying value disclosure.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

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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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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