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v3.20.2

Commitments and Contingencies (Details) | Jun. 27, 2020 employee
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Other Commitments [Line Items] |
Percentage of employees represented by various labor unions | 21.00%
Percentage of employees covered by CBAs | 1.00%
Minimum |
Other Commitments [Line Items] |
Entity number of employees | 2,000

X
- Definition Percentage Of Employees Covered By CBAs, Or Expired And Under Negotiation + References No definition available. + Details
Name: | bxc_PercentageOfEmployeesCoveredByCBAsOrExpiredAndUnderNegotiation
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 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
- 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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |