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v3.19.1

Subsequent Event (Details) - Subsequent Event $ in Millions | Feb. 28, 2019 USD ($)
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Subsequent Event [Line Items] |
Sale leaseback transaction, amount permitted | $ 50
Sale leaseback transaction, amount of net proceeds to be used for repayment of debt | $ 30

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- Definition Sale Leaseback Transaction, Amount Permitted + References No definition available. + Details
Name: | bxc_SaleLeasebackTransactionAmountPermitted
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sale Leaseback Transaction, Amount of Net Proceeds to be Used for Repayment of Debt + References No definition available. + Details
Name: | bxc_SaleLeasebackTransactionAmountofNetProceedstobeUsedforRepaymentofDebt
Namespace Prefix: | bxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |