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v3.23.1

Net Periodic Pension Cost (Benefit) - Narrative (Details) | 3 Months Ended
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Apr. 01, 2023
Minimum |
Defined Contribution Plan Disclosure [Line Items] |
Duration of termination of pension plan | 12 months
Maximum |
Defined Contribution Plan Disclosure [Line Items] |
Duration of termination of pension plan | 18 months

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- Definition Defined Benefit Plan, Pension Plan, Duration Of Termination + References No definition available. + Details
Name: | bxc_DefinedBenefitPlanPensionPlanDurationOfTermination
Namespace Prefix: | bxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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