Condensed Consolidated Statements of Changes in Partners' Capital/Stockholders' Equity - USD ($)	Total	Net old interest rate swap gain, net of tax	Net new interest rate swap loss, net of tax	Partners’ Capital	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Net old interest rate swap gain, net of tax	Accumulated Other Comprehensive Income Net new interest rate swap loss, net of tax	Retained Earnings	Non-Controlling Interests	Non-Controlling Interests Net old interest rate swap gain, net of tax	Non-Controlling Interests Net new interest rate swap loss, net of tax
Beginning balance at Jan. 31, 2021	$ 801,000,000			$ 801,000,000
Partners' Capital
Equity-based compensation	1,000,000			1,000,000
Net income	27,000,000			27,000,000
Net interest rate swap gain, net of tax	2,000,000			2,000,000
Distributions to partners	(10,000,000)			(10,000,000)
Ending balance at May. 02, 2021	821,000,000			821,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,000,000			27,000,000
Beginning balance at Jan. 31, 2021	801,000,000			801,000,000
Partners' Capital
Net income	146,000,000
Ending balance at Oct. 31, 2021				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	146,000,000
Net interest rate swap gain, net of tax	21,000,000
Ending balance at Oct. 31, 2021	1,759,000,000				$ 2,000,000	$ 1,000,000	$ 1,169,000,000	$ 8,000,000			$ 44,000,000	$ 535,000,000
Ending balance (in shares) at Oct. 31, 2021					160,067,161	85,853,383
Beginning balance at May. 02, 2021	821,000,000			821,000,000
Partners' Capital
Equity-based compensation	14,000,000			14,000,000
Net income	47,000,000			47,000,000
Net interest rate swap gain, net of tax	2,000,000			2,000,000
Distributions to partners	(13,000,000)			(13,000,000)
Ending balance at Jul. 22, 2021	871,000,000			871,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	47,000,000			47,000,000
Net income	(37,000,000)										(20,000,000)	(17,000,000)
Ending balance at Aug. 01, 2021				0
Partners' Capital
Reclassification of partners’ capital	0			(871,000,000)			871,000,000
Reorganization transactions	0				$ 1,000,000	$ 1,000,000	(2,000,000)
Reorganization transactions (in shares)					119,950,882	85,853,383
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(37,000,000)										(20,000,000)	(17,000,000)
Equity-based compensation	5,000,000						3,000,000					2,000,000
Net interest rate swap gain, net of tax		$ 4,000,000	$ (2,000,000)						$ 2,000,000	$ (1,000,000)			$ 2,000,000	$ (1,000,000)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	140,000,000						140,000,000
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(89,000,000)						(89,000,000)
Noncontrolling Interest, Adjustment For Vesting Of Partnership Interests	0						(8,000,000)					8,000,000
Ending balance at Aug. 01, 2021	1,548,000,000				$ 2,000,000	$ 1,000,000	1,090,000,000	(1,000,000)			(20,000,000)	476,000,000
Ending balance (in shares) at Aug. 01, 2021					154,834,603	85,853,383
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of non-controlling interests upon reorganization	0						(300,000,000)	(2,000,000)				302,000,000
Issuance of Class A Shares, net of issuance costs	656,000,000				$ 1,000,000		655,000,000
Issuance of Class A Shares, net of issuance costs					34,883,721
Non-controlling interests adjustment for purchase of Partnership Interests from Core & Main Holdings, LP	0						(180,000,000)					180,000,000
Beginning balance at Jul. 22, 2021	871,000,000			871,000,000
Partners' Capital
Net income	72,000,000
Ending balance at Oct. 31, 2021				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	72,000,000
Ending balance at Oct. 31, 2021	1,759,000,000				$ 2,000,000	$ 1,000,000	1,169,000,000	8,000,000			44,000,000	535,000,000
Ending balance (in shares) at Oct. 31, 2021					160,067,161	85,853,383
Beginning balance at Aug. 01, 2021				0
Partners' Capital
Net income	109,000,000										64,000,000	45,000,000
Ending balance at Oct. 31, 2021				$ 0
Beginning balance at Aug. 01, 2021	1,548,000,000				$ 2,000,000	$ 1,000,000	1,090,000,000	(1,000,000)			(20,000,000)	476,000,000
Beginning balance (in shares) at Aug. 01, 2021					154,834,603	85,853,383
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	109,000,000										64,000,000	45,000,000
Equity-based compensation	3,000,000						2,000,000					1,000,000
Net interest rate swap gain, net of tax	15,000,000		$ 15,000,000							$ 9,000,000				$ 6,000,000
Distributions to non-controlling interest holders	(17,000,000)											(17,000,000)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	4,000,000						4,000,000
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(3,000,000)						(3,000,000)
Noncontrolling Interest, Adjustment For Vesting Of Partnership Interests	0						(24,000,000)					24,000,000
Ending balance at Oct. 31, 2021	1,759,000,000				$ 2,000,000	$ 1,000,000	1,169,000,000	8,000,000			44,000,000	535,000,000
Ending balance (in shares) at Oct. 31, 2021					160,067,161	85,853,383
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A Shares, net of issuance costs	100,000,000				$ 0		100,000,000
Issuance of Class A Shares, net of issuance costs					5,232,558
Net income	137,000,000										86,000,000	51,000,000
Beginning balance at Jan. 30, 2022	1,831,000,000				$ 2,000,000	$ 1,000,000	1,214,000,000	16,000,000			92,000,000	506,000,000
Beginning balance (in shares) at Jan. 30, 2022					167,522,403	78,398,141
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	137,000,000										86,000,000	51,000,000
Equity-based compensation	3,000,000						2,000,000					1,000,000
Net interest rate swap gain, net of tax	37,000,000							23,000,000				14,000,000
Distributions to non-controlling interest holders	(3,000,000)											(3,000,000)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)					(55,595)	(55,713)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP							(1,000,000)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	1,000,000
Vesting of restricted stock units, net of tax withholdings (in shares)					1,321
Forfeiture of Class A Shares and Partnership Interests (in shares)					(20)	(34,703)
Noncontrolling Interest, Adjustment For Vesting Of Partnership Interests	0						(1,000,000)					1,000,000
Ending balance at May. 01, 2022	2,006,000,000				$ 2,000,000	$ 1,000,000	1,216,000,000	39,000,000			178,000,000	570,000,000
Ending balance (in shares) at May. 01, 2022					167,579,299	78,307,725
Partners' Capital
Net income	497,000,000
Beginning balance at Jan. 30, 2022	1,831,000,000				$ 2,000,000	$ 1,000,000	1,214,000,000	16,000,000			92,000,000	506,000,000
Beginning balance (in shares) at Jan. 30, 2022					167,522,403	78,398,141
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	497,000,000
Net interest rate swap gain, net of tax	60,000,000
Ending balance at Oct. 30, 2022	2,352,000,000				$ 2,000,000	$ 1,000,000	1,242,000,000	55,000,000			404,000,000	648,000,000
Ending balance (in shares) at Oct. 30, 2022					172,396,996	73,498,925
Partners' Capital
Net income	182,000,000										115,000,000	67,000,000
Beginning balance at May. 01, 2022	2,006,000,000				$ 2,000,000	$ 1,000,000	1,216,000,000	39,000,000			178,000,000	570,000,000
Beginning balance (in shares) at May. 01, 2022					167,579,299	78,307,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	182,000,000										115,000,000	67,000,000
Equity-based compensation	4,000,000						3,000,000					1,000,000
Net interest rate swap gain, net of tax	(9,000,000)							(6,000,000)				(3,000,000)
Distributions to non-controlling interest holders	(17,000,000)											(17,000,000)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)					(377,321)	(377,321)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(1,000,000)						(1,000,000)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(2,000,000)						(2,000,000)
Vesting of restricted stock units, net of tax withholdings (in shares)					6,955
Ending balance at Jul. 31, 2022	2,165,000,000				$ 2,000,000	$ 1,000,000	1,221,000,000	33,000,000			293,000,000	615,000,000
Ending balance (in shares) at Jul. 31, 2022					167,963,575	77,930,404
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period Value Exchange Of Partnership Interestshares	0						3,000,000					(3,000,000)
Net income	178,000,000										111,000,000	67,000,000
Net income	178,000,000										111,000,000	67,000,000
Equity-based compensation	2,000,000						2,000,000
Net interest rate swap gain, net of tax	32,000,000							20,000,000				12,000,000
Distributions to non-controlling interest holders	(21,000,000)											(21,000,000)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)					(4,431,479)	(4,431,479)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(27,000,000)						(27,000,000)
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP	(31,000,000)						(31,000,000)
Vesting of restricted stock units, net of tax withholdings (in shares)					1,942
Noncontrolling Interest, Adjustment For Vesting Of Partnership Interests	0						(11,000,000)					11,000,000
Ending balance at Oct. 30, 2022	2,352,000,000				$ 2,000,000	$ 1,000,000	1,242,000,000	$ 55,000,000			$ 404,000,000	648,000,000
Ending balance (in shares) at Oct. 30, 2022					172,396,996	73,498,925
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period Value Exchange Of Partnership Interestshares	$ 0						$ 34,000,000					$ (36,000,000)