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Commitments and Contingencies (Detail Textuals 1) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 04, 2014 Agreement | Dec. 29, 2012 | Dec. 31, 2011
Commitments And Contingencies [Line Items] |  |  |
Total rental expense | $ 4.8 | $ 4.8 | $ 4.8
Carrying amount of capital leases related to trucks and trailors | 15.4 | 10.3 | 5.0
Net book value of capital leases related to trucks and trailors | $ 11.1 | $ 9.3 | $ 4.0
Percentages of employees represented by various labour unions | 33.00% |  |
Number of collective bargaining agreements | 36 |  |
Number of collective bargaining agreements up for renewal | 5 |  |
Minimum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Capital leases maturity period | 5 years |  |
Maximum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Capital leases maturity period | 6 years |  |

X
- Definition Represents maturity period of capital leases. + References No definition available. + Details
Name: | bxc_CapitalLeasesMaturityPeriod
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents carrying amount of capital leases related to trucks and trailors. + References No definition available. + Details
Name: | bxc_CarryingAmountOfCapitalLeases
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | bxc_CommitmentsAndContingenciesLineItems
Namespace Prefix: | bxc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents net book value of capital leases related to trucks and trailors. + References No definition available. + Details
Name: | bxc_NetBookValueOfCapitalLeases
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents number of collective bargaining agreements. + References No definition available. + Details
Name: | bxc_NumberOfCollectiveBargainingAgreement
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents number of collective bargaining agreements up for renewal. + References No definition available. + Details
Name: | bxc_NumberOfCollectiveBargainingAgreementsUpForRenewal
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
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 Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration