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Summary of Significant Accounting Policies (Detail Textuals 3) (Long-Term Incentive Plan 2006, Performance Shares) | 12 Months Ended
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Jan. 03, 2009
Long-Term Incentive Plan 2006 | Performance Shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Performance shares granted | 834,071

X
- Definition These awards are liability awards paid out in cash, granted during 2008 and paid out in 2011. + References No definition available. + Details
Name: | bxc_PerformanceSharesVestedAsLiabilityAwards
Namespace Prefix: | bxc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration