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Commitments and Contingencies (Detail Textuals) | Sep. 29, 2012
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Commitments and Contingencies [Abstract] |
Percentage of total work force covered under collective bargaining agreements | 32.00%
Percentage of work force expired | 11.00%

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- Definition Percentage of employee labor contracts that expire within the next year. + References No definition available. + Details
Name: | bxc_PercentageOfEmployeeLaborContractsThatExpire
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of employees represented by various labor unions. + References No definition available. + Details
Name: | bxc_PercentageOfEmployeesRepresentedByVariousLaborUnions
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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