XML 86 R66.htm IDEA: XBRL DOCUMENT v3.22.4

Employee Benefits - Schedule of Fair Value of Total Assets By Category (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	$ 81,231	$ 94,269	$ 91,143
Pension plan
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	81,231	94,269
Pension plan | Quoted prices in active markets of identical assets (Level 1)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	15,253	2,399
Pension plan | Significant other observable inputs (Level 2)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Significant other unobservable inputs (Level 3)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Assets measured at net asset value (NAV)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	65,978	91,870
Pension plan | Return-seeking securities - Collective investment trust
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	6,683	69,397
Pension plan | Return-seeking securities - Collective investment trust | Quoted prices in active markets of identical assets (Level 1)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Return-seeking securities - Collective investment trust | Significant other observable inputs (Level 2)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Return-seeking securities - Collective investment trust | Significant other unobservable inputs (Level 3)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Return-seeking securities - Collective investment trust | Assets measured at net asset value (NAV)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	6,683	69,397
Pension plan | Liability-matching securities - Collective investment trusts
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	59,295	22,473
Pension plan | Liability-matching securities - Collective investment trusts | Quoted prices in active markets of identical assets (Level 1)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Liability-matching securities - Collective investment trusts | Significant other observable inputs (Level 2)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Liability-matching securities - Collective investment trusts | Significant other unobservable inputs (Level 3)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Liability-matching securities - Collective investment trusts | Assets measured at net asset value (NAV)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	59,295	22,473
Pension plan | Cash
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	15,253	2,399
Pension plan | Cash | Quoted prices in active markets of identical assets (Level 1)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	15,253	2,399
Pension plan | Cash | Significant other observable inputs (Level 2)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Cash | Significant other unobservable inputs (Level 3)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	0	0
Pension plan | Cash | Assets measured at net asset value (NAV)
Asset allocation structure of the portfolio
Fair value of plan assets by asset category	$ 0	$ 0

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

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=bxc_ReturnSeekingSecuritiesCollectiveInvestmentTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=bxc_LiabilityMatchingSecuritiesCollectiveInvestmentTrustsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: