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Commitments and Contingencies (Detail Textuals) | 12 Months Ended
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Jan. 03, 2015 Employee
Commitments and Contingencies Disclosure [Abstract] |
Purchase Commitment, Term | 1 year
Number of persons employed on full-time basis | 1,700 dei_EntityNumberOfEmployees
Percentages of employees represented by various labour unions | 34.00%bxc_PercentageOfEmployeesRepresentedByVariousLaborUnions
Percentage of collective bargaining agreements up for renewal | 30.00%bxc_NumberOfCollectiveBargainingAgreementsUpForRenewal

X
- Definition Represents number of collective bargaining agreements up for renewal. + References No definition available. + Details
Name: | bxc_NumberOfCollectiveBargainingAgreementsUpForRenewal
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

X
- Definition Purchase Commitment, Term + References No definition available. + Details
Name: | bxc_PurchaseCommitmentTerm
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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