Business Combination, Number Of Branch Locations Acquired

No definition available.

Name:	cnm_BusinessCombinationNumberOfBranchLocationsAcquired
Namespace Prefix:	cnm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Business Combination, Transaction Valuation

+ References

No definition available.

+ Details

Name:	cnm_BusinessCombinationTransactionValuation
Namespace Prefix:	cnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

+ Details

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

- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-1

+ Details

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

- Definition

Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

+ Details

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

- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479303/805-10-55-37

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_MidwestPipeSupplyIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_LandscapeConstructionSuppliesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_DanaKepnerCompanyLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_EasternSupplyInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_ACFWestInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_EGWUtilitiesInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_FosterSupplyIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_JWDAngeloCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_GroGreenSolutionsGeorgiaLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_HMPipeProductsLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cnm_GreenEquipmentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisitions - Narrative (Details) $ in Millions	9 Months Ended
Acquisitions - Narrative (Details) $ in Millions	Oct. 27, 2024 USD ($)	Oct. 29, 2023 USD ($)	Sep. 16, 2024 branch_location	Sep. 09, 2024 branch_location	Aug. 12, 2024 branch_location	May 06, 2024 branch_location	Apr. 30, 2024 branch_location	Apr. 01, 2024 branch_location	Mar. 07, 2024 branch_location	Feb. 12, 2024 branch_location	Jul. 12, 2023 branch_location	Jul. 10, 2023 branch_location	Apr. 17, 2023 branch_location	Mar. 06, 2023 branch_location
Business Acquisition [Line Items]
Transaction value \| $	$ 748	$ 161
Goodwill, expected tax deductible amount \| $	238	3
Intangible assets \| $	277	76
Deferred income taxes \| $	39	8
Property, plant and equipment \| $	16	$ 24
Midwest Pipe Supply Inc.
Business Acquisition [Line Items]
Number of branch locations acquired													1
Landscape & Construction Supplies LLC
Business Acquisition [Line Items]
Number of branch locations acquired														2
Dana Kepner Company LLC
Business Acquisition [Line Items]
Number of branch locations acquired									21
Intangible assets \| $	184
Deferred income taxes \| $	34
Property, plant and equipment \| $	$ 8
Eastern Supply Inc.
Business Acquisition [Line Items]
Number of branch locations acquired										2
ACF West Inc.
Business Acquisition [Line Items]
Number of branch locations acquired								6
EGW Utilities Inc.
Business Acquisition [Line Items]
Number of branch locations acquired						1	1
Foster Supply Inc.
Business Acquisition [Line Items]
Number of branch locations acquired												7
J.W. D’Angelo Co.
Business Acquisition [Line Items]
Number of branch locations acquired											3
GroGreen Solutions Georgia, LLC
Business Acquisition [Line Items]
Number of branch locations acquired				4
HM Pipe Products LP
Business Acquisition [Line Items]
Number of branch locations acquired					2
Green Equipment Company
Business Acquisition [Line Items]
Number of branch locations acquired			1