XML 98 R81.htm IDEA: XBRL DOCUMENT v3.25.0.1

Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 28, 2024 USD ($) employee agreement
Gain Contingencies [Line Items]
Entity number of employees | employee	2,000
Percentage of employees, employed on part time basis (less than)	1.00%
Percentages of employees represented by various labor unions	20.00%
Number of CBAs, renewals in next fiscal year | agreement	6
Employees are up for renewal	6.00%
Number of renewals renegotiated | agreement	1
Unpaid Duties
Gain Contingencies [Line Items]
Regulatory liability | $	$ 8.0
Reduction in regulatory liability | $	$ 8.0

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

Number Of Collective Bargaining Agreements, Renewals Renegotiated

+ References

No definition available.

+ Details

Name:	bxc_NumberOfCollectiveBargainingAgreementsRenewalsRenegotiated
Namespace Prefix:	bxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483049/450-30-50-1

+ Details

Name:	us-gaap_GainContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in regulated liabilities. Regulated liabilities are created when regulatory agency permits an entity to defer revenues to the balance sheet.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_IncreaseDecreaseInRegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

+ Details

Name:	us-gaap_RegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RegulatoryLiabilityAxis=bxc_UnpaidDutiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: