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v2.4.1.9

Lease Commitments Lease Commitments (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 03, 2015 | Jan. 04, 2014 | Dec. 29, 2012
Capital Leased Assets [Line Items] |  |  |
Total rent expense | $ 4.5 us-gaap_LeaseAndRentalExpense | $ 4.8 us-gaap_LeaseAndRentalExpense | $ 4.8 us-gaap_LeaseAndRentalExpense
Basis of assets under capital leases | 16.4 bxc_CarryingAmountOfCapitalLeases | 15.4 bxc_CarryingAmountOfCapitalLeases |
Net book value of assets under capital leases | $ 9.0 bxc_NetBookValueOfCapitalLeases | $ 11.1 bxc_NetBookValueOfCapitalLeases |
Minimum |  |  |
Capital Leased Assets [Line Items] |  |  |
Capital lease maturity |  | 5 years |
Capital lease interest rate | 4.00%bxc_CapitalLeasesInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum |  |  |
Capital Leased Assets [Line Items] |  |  |
Capital lease maturity |  | 7 years |
Capital lease interest rate | 7.60%bxc_CapitalLeasesInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
- Definition Capital Leases, Interest Rate + References No definition available. + Details
Name: | bxc_CapitalLeasesInterestRate
Namespace Prefix: | bxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |