Basis of Presentation & Description of Business (Policies)	9 Months Ended
Oct. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation - Consolidation	The accompanying unaudited condensed consolidated financial statements present the results of operations, financial position and cash flows of Core & Main and its subsidiaries, which includes the consolidated financial statements of Holdings and its consolidated subsidiary, Core & Main LP, as the legal entity that conducts the operations of the Company. Holdings is considered a variable interest entity. Core & Main is the primary beneficiary and general partner of Holdings and has decision making authority that significantly affects the economic performance of Holdings. As a result, Core & Main consolidates the consolidated financial statements of Holdings. All intercompany balances and transactions have been eliminated in consolidation. The Company records non-controlling interests related to Partnership Interest held by the Continuing Limited Partners in Holdings on its consolidated statements of operations and comprehensive income. The ownership interest of the Continuing Limited Partners related to Partnership Interests held by the Continuing Limited Partners is reflected as non-controlling interests in Core & Main’s consolidated Balance Sheets.
Basis of Presentation - Accounting	In management’s opinion, the unaudited condensed consolidated financial information for the interim periods presented include all normal recurring adjustments necessary for a fair statement of the Company's results of operations, financial position and cash flows, which include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Revenues, expenses, assets and liabilities can vary during each quarter of the year. Therefore, the results and trends in these interim unaudited condensed consolidated financial statements may not be the same as those for the full year. The January 30, 2022 condensed consolidated Balance Sheet was derived from audited financial statements as of that date, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto as of and for the fiscal year ended January 30, 2022 included in our 2021 Annual Report on Form 10-K.
Fiscal Year	Fiscal Year The Company’s fiscal year is a 52- or 53-week period ending on the Sunday nearest to January 31st. Quarters within the fiscal year include 13-week periods, unless a fiscal year includes a 53rd week, in which case the fourth quarter of the fiscal year will be a 14-week period. Each of the three months ended October 30, 2022 and three months ended October 31, 2021 included 13 weeks and each of the nine months ended October 30, 2022 and nine months ended October 31, 2021 included 39 weeks. The current fiscal year ending January 29, 2023 (“fiscal 2022”) will include 52 weeks.
Estimates	Estimates Management has made a number of estimates and assumptions relating to the reporting of certain assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of revenues and expenses in preparing the elements of these financial statements in conformity with U.S. GAAP. Actual results could differ from these estimates.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS Reference Rate Reform - In March 2020, the Financial Accounting Standards Board issued ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”). The new guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by ASU 2020-04 are effective for prospective contract modifications made and qualifying hedging relationships entered into as of March 12, 2020 through December 31, 2024. In July 2022, the Company amended the terms of the Senior ABL Credit Facility (as defined below) in order to, among other things, implement a forward-looking rate based on the secured overnight financing rate (“SOFR”) in lieu of LIBOR. The guidance of ASU 2020-04 did not have an impact on the assessment of the Senior ABL Credit Facility amendment. At the time of a qualifying future transaction that replace LIBOR with a new interest rate index, the Company will consider the application of ASU 2020-04.

Basis of Presentation & Description of Business (Policies)

9 Months Ended

Oct. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying unaudited condensed consolidated financial statements present the results of operations, financial position and cash flows of Core & Main and its subsidiaries, which includes the consolidated financial statements of Holdings and its consolidated subsidiary, Core & Main LP, as the legal entity that conducts the operations of the Company. Holdings is considered a variable interest entity. Core & Main is the primary beneficiary and general partner of Holdings and has decision making authority that significantly affects the economic performance of Holdings. As a result, Core & Main consolidates the consolidated financial statements of Holdings. All intercompany balances and transactions have been eliminated in consolidation. The Company records non-controlling interests related to Partnership Interest held by the Continuing Limited Partners in Holdings on its consolidated statements of operations and comprehensive income. The ownership interest of the Continuing Limited Partners related to Partnership Interests held by the Continuing Limited Partners is reflected as non-controlling interests in Core & Main’s consolidated Balance Sheets.

Basis of Presentation - Accounting

In management’s opinion, the unaudited condensed consolidated financial information for the interim periods presented include all normal recurring adjustments necessary for a fair statement of the Company's results of operations, financial position and cash flows, which include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Revenues, expenses, assets and liabilities can vary during each quarter of the year. Therefore, the results and trends in these interim unaudited condensed consolidated financial statements may not be the same as those for the full year. The January 30, 2022 condensed consolidated Balance Sheet was derived from audited financial statements as of that date, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto as of and for the fiscal year ended January 30, 2022 included in our 2021 Annual Report on Form 10-K.

Fiscal Year

Fiscal Year The Company’s fiscal year is a 52- or 53-week period ending on the Sunday nearest to January 31st. Quarters within the fiscal year include 13-week periods, unless a fiscal year includes a 53rd week, in which case the fourth quarter of the fiscal year will be a 14-week period. Each of the three months ended October 30, 2022 and three months ended October 31, 2021 included 13 weeks and each of the nine months ended October 30, 2022 and nine months ended October 31, 2021 included 39 weeks. The current fiscal year ending January 29, 2023 (“fiscal 2022”) will include 52 weeks.

Estimates

Estimates Management has made a number of estimates and assumptions relating to the reporting of certain assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of revenues and expenses in preparing the elements of these financial statements in conformity with U.S. GAAP. Actual results could differ from these estimates.

Recent Accounting Pronouncements

RECENT ACCOUNTING PRONOUNCEMENTS

Reference Rate Reform - In March 2020, the Financial Accounting Standards Board issued ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”). The new guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by ASU 2020-04 are effective for prospective contract modifications made and qualifying hedging relationships entered into as of March 12, 2020 through December 31, 2024.

In July 2022, the Company amended the terms of the Senior ABL Credit Facility (as defined below) in order to, among other things, implement a forward-looking rate based on the secured overnight financing rate (“SOFR”) in lieu of LIBOR. The guidance of ASU 2020-04 did not have an impact on the assessment of the Senior ABL Credit Facility amendment.

At the time of a qualifying future transaction that replace LIBOR with a new interest rate index, the Company will consider the application of ASU 2020-04.