Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jan. 30, 2022	Jul. 22, 2021	Jan. 30, 2022		Jan. 31, 2021	Feb. 02, 2020
Income Statement [Abstract]
Net income	$ 92	$ 74	$ 166	[1]	$ 37	$ 36

[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 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.