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v3.23.2

Commitments and Contingencies (Details) employee in Thousands | 6 Months Ended
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Jul. 01, 2023 employee Agreement
Commitments and Contingencies Disclosure [Abstract] |
Entity number of employees | employee | 2
Percentage of employees, employed on part time basis | 1.00%
Percentage of employees represented by various labor unions | 19.00%
Number of CBAs up for renewal, next fiscal year agreement | Agreement | 2
Employees are up for renewal | 5.00%

X
- Definition Number Of Collective Bargaining Agreements, Renewals In Next Fiscal Year + References No definition available. + Details
Name: | bxc_NumberOfCollectiveBargainingAgreementsRenewalsInNextFiscalYear
Namespace Prefix: | bxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Employees, Employed On Part Time Basis + References No definition available. + Details
Name: | bxc_PercentageOfEmployeesEmployedOnPartTimeBasis
Namespace Prefix: | bxc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Employees Represented Are Up For Renewal + References No definition available. + Details
Name: | bxc_PercentageOfEmployeesRepresentedAreUpForRenewal
Namespace Prefix: | bxc_
Data Type: | dtr-types1: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: | dtr-types1: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
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration