Cover - shares	3 Months Ended
	Apr. 28, 2024	May 31, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Apr. 28, 2024
Document Transition Report	false
Entity File Number	001-40650
Entity Registrant Name	Core & Main, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-3149194
Entity Address, Address Line One	1830 Craig Park Court
Entity Address, City or Town	St. Louis
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63146
City Area Code	314
Local Phone Number	432-4700
Title of 12(b) Security	Class A common stock, par value $0.01 per share
Trading Symbol	CNM
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001856525
Current Fiscal Year End Date	--02-05
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		192,918,657
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		8,540,566