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Summary of Significant Accounting Policies (Detail Textuals 2) (Long-Term Incentive Plan 2006, Performance Shares) | 3 Months Ended
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Mar. 30, 2013
Long-Term Incentive Plan 2006 | Performance Shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Performance shares granted and approved during the period | 1,872,852
Performance shares expected to vest | 1,749,815

X
- Definition The number of grants made during the period on stock based awards. + References No definition available. + Details
Name: | bxc_PerformanceSharesGrantedAndApprovedDuringPeriod
Namespace Prefix: | bxc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested and expected to vest. + References No definition available. + Details
Name: | bxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestInPeriod
Namespace Prefix: | bxc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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