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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. 04, 2014
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 | 2,969,424
Performance shares expected to vest | 2,192,868

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
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of performance shares granted during the period that will vest upon successful achievement of certain financial and strategic goals approved by the Compensation Committee. + References No definition available. + Details
Name: | bxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsPerformanceSharesGranted
Namespace Prefix: | bxc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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