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Fair Value Measurements (Detail Textuals) (USD $) In Millions, unless otherwise specified | Jun. 29, 2013 | Dec. 29, 2012
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Fair Value Measurements [Abstract] |  |
Mortgage discounted carrying value | $ 201.8 | $ 206.0
Mortgage fair value | $ 201.4 | $ 205.5

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- Definition Mortgage loan discounted carrying value disclosure. + References No definition available. + Details
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Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration