XML 57 R38.htm IDEA: XBRL DOCUMENT v3.23.1

Net Periodic Pension Cost (Benefit) - Narrative (Details)	3 Months Ended
	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

X

- 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

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_DefinedContributionPlanDisclosureLineItems
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:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: