Basic and Diluted Earnings Per Share - Calculation (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended		12 Months Ended
	Jan. 30, 2022		Jan. 28, 2024	Jan. 29, 2023	Jan. 30, 2022
Basic earnings per share:
Net income	$ 151		$ 531	$ 581	$ 225
Net income attributable to non-controlling interests	61		160	215
Net income available to Class A common stock	$ 90		$ 371	$ 366
Weighted average shares outstanding - basic	159,188,391	[1]	172,839,836	169,482,199
Net income per share - basic (in dollars per share)	$ 0.57	[1]	$ 2.15	$ 2.16
Diluted earnings per share:
Net income available to common shareholders - basic	$ 90		$ 371	$ 366
Increase to net income attributable to dilutive instruments	44		118	159
Net income available to common shareholders - diluted	$ 134		$ 489	$ 525
Weighted average shares outstanding - basic	159,188,391	[1]	172,839,836	169,482,199
Incremental shares of common stock attributable to dilutive instruments	85,263,287		54,978,241	76,734,805
Weighted average shares outstanding - diluted	244,451,678	[1]	227,818,077	246,217,004
Net income per share - diluted (in dollars per share)	$ 0.55	[1]	$ 2.15	$ 2.13

[1] For the fiscal year ended January 30, 2022, this schedule represents basic and diluted earnings per share of Class A common stock and weighted average shares of Class A common stock outstanding for the period from July 23, 2021 through January 30, 2022, which is the period following the Reorganization Transactions described in Note 1. The Company analyzed the calculation of earnings per share for the periods prior to the Reorganization Transactions and determined that it resulted in values that would not be meaningful to the users of the consolidated financial statements. Therefore, there is no earnings per share attributable to Core & Main, Inc. for the periods prior to the Reorganization Transactions on July 22, 2021. Refer to calculation of earnings per share in Note 12.