Schedule I — Condensed Financial Information of Parent - Condensed Statement of Operations and Comprehensive Income (Details) - USD ($) $ in Millions	6 Months Ended		10 Months Ended	12 Months Ended
	Jan. 30, 2022	Jul. 22, 2021	Jan. 30, 2022	Jan. 30, 2022		Jan. 31, 2021	Feb. 02, 2020
Condensed Statement of Income Captions [Line Items]
Income before provision for income taxes				$ 276		$ 46	$ 42
Provision for income taxes				51		9	6
Net income	$ 92	$ 74		166	[1]	37	36
Net interest rate swap gain (loss), net of tax				34		$ 3	$ (10)
Comprehensive income				$ 188
Parent Company
Condensed Statement of Income Captions [Line Items]
Equity in net income of subsidiary			$ 119
Income before provision for income taxes			119
Provision for income taxes			27
Net income			92
Net interest rate swap gain (loss), net of tax			18
Comprehensive income			$ 110

[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.