Non-controlling Interests (Details) - Holdings - shares			3 Months Ended
	Oct. 31, 2021	Jul. 23, 2021	Oct. 31, 2021
Partnership Interests
Partnership Interests (in units)	242,859,773	200,785,693	242,859,773
Issuance of Partnership Interests (in units)			40,116,279
Vesting of Partnership Interests (in units)			1,957,801
Ownership Percentage
Ownership Percentage	100.00%	100.00%
Issuance of Partnership Interests (percent)			0.00%
Vesting of Partnership Interests (percent)			0.00%
Core & Main
Partnership Interests
Partnership Interests (in units)	160,067,161	119,950,882	160,067,161
Issuance of Partnership Interests (in units)			40,116,279
Vesting of Partnership Interests (in units)			0
Ownership Percentage
Ownership Percentage	65.91%	59.74%
Issuance of Partnership Interests (percent)			6.70%
Vesting of Partnership Interests (percent)			(0.54%)
Continuing Limited Partners
Partnership Interests
Partnership Interests (in units)	82,792,612	80,834,811	82,792,612
Issuance of Partnership Interests (in units)			0
Vesting of Partnership Interests (in units)			1,957,801
Ownership Percentage
Ownership Percentage	34.09%	40.26%
Issuance of Partnership Interests (percent)			(6.70%)
Vesting of Partnership Interests (percent)			0.54%