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Lease Commitments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Leases [Abstract] |  |  |
Total rent expense | $ 4.2 | $ 4.8 | $ 4.5
Capital Leased Assets [Line Items] |  |  |
Basis of assets under capital leases | 20.8 | 22.1 |
Net book value of assets under capital leases | $ 9.0 | $ 11.5 |

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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration