Non-controlling Interests (Details) - Holdings - shares			6 Months Ended
	Jan. 30, 2022	Jul. 23, 2021	Jan. 30, 2022
Partnership Interests
Partnership Interests (in units)	242,866,811	200,785,693	242,866,811
Issuance of Partnership Interests (in units)			40,116,279
Exchange of Partnership Interests (in units)			0
Vesting of Partnership Interests (in units)			1,964,839
Ownership Percentage
Ownership Percentage	100.00%	100.00%
Issuance of Partnership Interests (percent)			0.00%
Exchange of Partnership Interests (percent)			0.00%
Vesting of Partnership Interests (percent)			0.00%
Core & Main
Partnership Interests
Partnership Interests (in units)	167,522,403	119,950,882	167,522,403
Issuance of Partnership Interests (in units)			40,116,279
Exchange of Partnership Interests (in units)			7,455,242
Vesting of Partnership Interests (in units)			0
Ownership Percentage
Ownership Percentage	69.00%	59.70%
Issuance of Partnership Interests (percent)			6.70%
Exchange of Partnership Interests (percent)			3.10%
Vesting of Partnership Interests (percent)			(0.50%)
Continuing Limited Partners
Partnership Interests
Partnership Interests (in units)	75,344,408	80,834,811	75,344,408
Issuance of Partnership Interests (in units)			0
Exchange of Partnership Interests (in units)			(7,455,242)
Vesting of Partnership Interests (in units)			1,964,839
Ownership Percentage
Ownership Percentage	31.00%	40.30%
Issuance of Partnership Interests (percent)			(6.70%)
Exchange of Partnership Interests (percent)			(3.10%)
Vesting of Partnership Interests (percent)			0.50%