Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Total	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interests	Class A Common Stock	Class A Common Stock Common Stock	Class B Common Stock Common Stock
Beginning balance (in shares) at Jan. 28, 2024							191,663,608	9,630,186
Beginning balance at Jan. 28, 2024	$ 1,524,000,000	$ 1,214,000,000	$ 189,000,000	$ 46,000,000	$ 73,000,000		$ 2,000,000	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	101,000,000		95,000,000		6,000,000
Equity-based compensation	3,000,000	3,000,000
Net comprehensive loss, net of tax	18,000,000			17,000,000	1,000,000
Distributions to non-controlling interest holders	(4,000,000)	(2,000,000)			(2,000,000)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)							812,612	816,654
Exchange of Partnership Interests and Class B Shares for Class A Shares	0	4,000,000			(4,000,000)
Establishment/adjustment of deferred tax asset associated with Core & Main investment in Core & Main Holdings, LP	13,000,000	13,000,000
Establishment of Tax receivable agreement liabilities	(10,000,000)	(10,000,000)
Activity under equity-based compensation plans, net of tax withholdings (in shares)							158,097
Activity under equity-based compensation plans, net of tax withholdings	(1,000,000)	(1,000,000)
Ending balance (in shares) at Apr. 28, 2024							192,634,317	8,813,532
Ending balance at Apr. 28, 2024	1,644,000,000	1,221,000,000	284,000,000	63,000,000	74,000,000		$ 2,000,000	$ 0
Beginning balance (in shares) at Jan. 28, 2024							191,663,608	9,630,186
Beginning balance at Jan. 28, 2024	1,524,000,000	1,214,000,000	189,000,000	46,000,000	73,000,000		$ 2,000,000	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	227,000,000
Net comprehensive loss, net of tax	(15,000,000)
Repurchase and Retirement of Class A and Class B shares and corresponding Partnership Interest (in shares)						(429,996)
Repurchase and Retirement of equity interests	(21,000,000)
Ending balance (in shares) at Jul. 28, 2024							192,642,689	8,483,709
Ending balance at Jul. 28, 2024	1,720,000,000	1,225,000,000	385,000,000	32,000,000	76,000,000		$ 2,000,000	$ 0
Beginning balance (in shares) at Apr. 28, 2024							192,634,317	8,813,532
Beginning balance at Apr. 28, 2024	1,644,000,000	1,221,000,000	284,000,000	63,000,000	74,000,000		$ 2,000,000	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	126,000,000		119,000,000		7,000,000
Equity-based compensation	4,000,000	4,000,000
Net comprehensive loss, net of tax	(33,000,000)			(31,000,000)	(2,000,000)
Distributions to non-controlling interest holders	(2,000,000)	(1,000,000)			(1,000,000)
Repurchase and Retirement of Class A and Class B shares and corresponding Partnership Interest (in shares)							(429,996)
Repurchase and Retirement of equity interests	(21,000,000)	(3,000,000)	(18,000,000)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)							326,889	329,823
Exchange of Partnership Interests and Class B Shares for Class A Shares	0	2,000,000			(2,000,000)
Establishment/adjustment of deferred tax asset associated with Core & Main investment in Core & Main Holdings, LP	5,000,000	5,000,000
Establishment of Tax receivable agreement liabilities	(4,000,000)	(4,000,000)
Activity under equity-based compensation plans, net of tax withholdings (in shares)							111,479
Activity under equity-based compensation plans, net of tax withholdings	1,000,000	1,000,000
Ending balance (in shares) at Jul. 28, 2024							192,642,689	8,483,709
Ending balance at Jul. 28, 2024	1,720,000,000	1,225,000,000	385,000,000	32,000,000	76,000,000		$ 2,000,000	$ 0
Beginning balance (in shares) at Feb. 02, 2025							189,815,899	7,936,061
Beginning balance at Feb. 02, 2025	1,774,000,000	1,220,000,000	449,000,000	27,000,000	76,000,000		$ 2,000,000	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	105,000,000		100,000,000		5,000,000
Equity-based compensation	5,000,000	5,000,000
Net comprehensive loss, net of tax	(21,000,000)			(20,000,000)	(1,000,000)
Distributions to non-controlling interest holders	(2,000,000)				(2,000,000)
Repurchase and Retirement of Class A and Class B shares and corresponding Partnership Interest (in shares)							(837,268)
Repurchase and Retirement of equity interests	(39,000,000)	(5,000,000)	(34,000,000)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)							279,352	286,571
Exchange of Partnership Interests and Class B Shares for Class A Shares	0	1,000,000			(1,000,000)
Establishment/adjustment of deferred tax asset associated with Core & Main investment in Core & Main Holdings, LP	4,000,000	4,000,000
Establishment of Tax receivable agreement liabilities	(4,000,000)	(4,000,000)
Share issuances under equity-based compensation plans, net of tax withholdings (shares)							193,286
Activity under equity-based compensation plans, net of tax withholdings	(1,000,000)	(1,000,000)
Ending balance (in shares) at May. 04, 2025							189,451,269	7,649,490
Ending balance at May. 04, 2025	1,821,000,000	1,220,000,000	515,000,000	7,000,000	77,000,000		$ 2,000,000	$ 0
Beginning balance (in shares) at Feb. 02, 2025							189,815,899	7,936,061
Beginning balance at Feb. 02, 2025	1,774,000,000	1,220,000,000	449,000,000	27,000,000	76,000,000		$ 2,000,000	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	246,000,000
Net comprehensive loss, net of tax	(29,000,000)
Repurchase and Retirement of Class A and Class B shares and corresponding Partnership Interest (in shares)						(959,103)
Repurchase and Retirement of equity interests	(47,000,000)
Ending balance (in shares) at Aug. 03, 2025							190,491,983	6,932,015
Ending balance at Aug. 03, 2025	1,962,000,000	1,243,000,000	642,000,000	(1,000,000)	76,000,000		$ 2,000,000	$ 0
Beginning balance (in shares) at May. 04, 2025							189,451,269	7,649,490
Beginning balance at May. 04, 2025	1,821,000,000	1,220,000,000	515,000,000	7,000,000	77,000,000		$ 2,000,000	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	141,000,000		134,000,000		7,000,000
Equity-based compensation	5,000,000	5,000,000
Net comprehensive loss, net of tax	(8,000,000)			(8,000,000)
Distributions to non-controlling interest holders	(2,000,000)				(2,000,000)
Repurchase and Retirement of Class A and Class B shares and corresponding Partnership Interest (in shares)							(121,835)
Repurchase and Retirement of equity interests	(8,000,000)	(1,000,000)	(7,000,000)
Exchange of Partnership Interests and Class B Shares for Class A Shares (in shares)							706,438	717,475
Exchange of Partnership Interests and Class B Shares for Class A Shares	0	6,000,000			(6,000,000)
Establishment/adjustment of deferred tax asset associated with Core & Main investment in Core & Main Holdings, LP	13,000,000	13,000,000
Establishment of Tax receivable agreement liabilities	(11,000,000)	(11,000,000)
Activity under equity-based compensation plans, net of tax withholdings (in shares)							456,111
Activity under equity-based compensation plans, net of tax withholdings	11,000,000	11,000,000
Ending balance (in shares) at Aug. 03, 2025							190,491,983	6,932,015
Ending balance at Aug. 03, 2025	$ 1,962,000,000	$ 1,243,000,000	$ 642,000,000	$ (1,000,000)	$ 76,000,000		$ 2,000,000	$ 0