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Fair Value Measurements (Detail Textuals) (USD $) In Millions, unless otherwise specified | Jan. 04, 2014 | Dec. 29, 2012
--- | --- | ---
Discounted carrying value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Value of mortgage | $ 186.9 | $ 206.0
Fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Value of mortgage | $ 186.6 | $ 205.5

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- Definition Represents mortgage loan fair 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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- Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration