Consolidated Statements of Changes in Stockholders' Equity/Partners' Capital - USD ($) $ in Millions		Total	Interest rate swap 1	Interest rate swap 2	Partners’ Capital	Common Stock Class A common stock	Common Stock Class B common stock	Additional Paid In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Interest rate swap 1	Accumulated Other Comprehensive Income (Loss) Interest rate swap 2	Retained Earnings	Non-Controlling Interests	Non-Controlling Interests Interest rate swap 1	Non-Controlling Interests Interest rate swap 2
Beginning balance at Jan. 31, 2021		$ 801			$ 801
Partners' Capital
Equity-based compensation		15			15
Net income		74			74
Net interest rate swap gain (loss), net of tax		4			4
Distributions to partners		(23)			(23)
Ending balance at Jul. 22, 2021		871			871
Beginning balance at Jan. 31, 2021		801			801
Partners' Capital
Net income	[1]	166
Ending balance at Jan. 30, 2022					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		225
Net interest rate swap gain (loss), net of tax		34
Ending balance (in shares) at Jan. 30, 2022						167,522,403	78,398,141
Ending balance at Jan. 30, 2022		1,831				$ 2	$ 1	$ 1,214	$ 16			$ 92	$ 506
Beginning balance at Jul. 22, 2021		871			871
Partners' Capital
Net income		92
Ending balance at Jan. 30, 2022					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of partners’ capital		0			(871)			871
Reorganization transactions (in shares)						119,950,882	85,853,383
Reorganization transactions		0				$ 1	$ 1	(2)
Reclassification of non-controlling interests upon reorganization		0						(300)	(2)				302
Issuance of Class A Shares, net of issuance costs (in shares)						40,116,279
Issuance of Class A Shares, net of issuance costs		756				$ 1		755
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP		200						200
Net income		151										92	59
Equity-based compensation		10						7					3
Net interest rate swap gain (loss), net of tax			$ 4	$ 26						$ 2	$ 16			$ 2	$ 10
Distributions to non-controlling interest holders		(34)											(34)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)						7,455,242	(7,455,242)
Exchange of Partnership Interests for Class A Shares		0						49					(49)
Establishment of Tax Receivable Agreement Liabilities		(153)						(153)
Non-controlling interests adjustment for purchase of Partnership Interests and vesting of Core & Main Holdings, LP Partnership Interests held by non-controlling interests		0						(213)					213
Ending balance (in shares) at Jan. 30, 2022						167,522,403	78,398,141
Ending balance at Jan. 30, 2022		1,831				$ 2	$ 1	1,214	16			92	506
Partners' Capital
Net income		366
Ending balance at Jan. 29, 2023					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP		30						30
Net income		581										366	215
Equity-based compensation		11						8					3
Net interest rate swap gain (loss), net of tax		44							27				17
Distributions to non-controlling interest holders		(54)						(6)					(48)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)						5,132,134	(5,133,763)
Exchange of Partnership Interests for Class A Shares		0						40	2				(42)
Establishment of Tax Receivable Agreement Liabilities		(34)						$ (34)
Activity under equity-based compensation plans, net of tax withholdings						110,644		1,000,000
Activity under equity-based compensation plans, net of tax withholdings		1
Forfeiture of Class A Shares and Partnership Interests (in shares)						(20)	(34,703)
Forfeiture of Class A Shares and Partnership Interests		0
Non-controlling interests adjustment for purchase of Partnership Interests and vesting of Core & Main Holdings, LP Partnership Interests held by non-controlling interests		0						$ (12)					12
Ending balance (in shares) at Jan. 29, 2023						172,765,161	73,229,675
Ending balance at Jan. 29, 2023		2,410				$ 2	$ 1	1,241	45			458	663
Partners' Capital
Net income		371
Ending balance at Jan. 28, 2024					$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment of deferred tax liability associated with Core & Main investment in Core & Main Holdings, LP		515						515
Net income		531										371	160
Equity-based compensation		10						8					2
Net interest rate swap gain (loss), net of tax		(22)							(18)				(4)
Distributions to non-controlling interest holders		(42)						(5)					(37)
Repurchased and Retirement of Class A and Class B shares and corresponding Partnership Interest (in shares) During Period, Shares						(28,131,551)	(16,868,449)
Repurchase and Retirement of Class A and Class B shares and corresponding Partnership Interest		1,344						324				640	380
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)						46,683,021	(46,731,040)
Exchange of Partnership Interests for Class A Shares		0					$ (1)	313	19				(331)
Establishment of Tax Receivable Agreement Liabilities		(537)						$ (537)
Activity under equity-based compensation plans, net of tax withholdings						346,977		3,000,000
Activity under equity-based compensation plans, net of tax withholdings		3
Ending balance (in shares) at Jan. 28, 2024						191,663,608	9,630,186
Ending balance at Jan. 28, 2024		$ 1,524				$ 2	$ 0	$ 1,214	$ 46			$ 189	$ 73

[1] For the fiscal year ended January 30, 2022, the net income attributable to Core & Main, Inc. includes net income prior to the Reorganization Transactions (as defined in Note 1) of $74 million and net income subsequent to the Reorganization Transactions of $92 million. Refer to the Statements of Changes in Stockholders’ Equity/Partners’ Capital for a summary of net income attributable to Core & Main, Inc. subsequent to the Reorganization Transactions. See Note 1 for a description of the Basis of Presentation of the consolidated financial statements.