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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2025	Mar. 31, 2026
River Valley Pipe
Business Combination [Line Items]
Total fair value of consideration transferred	$ 18.8
National Diversified Sales
Business Combination [Line Items]
Recognized asset acquired to liability assumed, excess (less)		$ 972.5
Payments to acquire businesses, gross		984.9
Cash acquired from acquisition		3.2
Cash held for sale from acquisition		$ 9.2
Transaction costs related to acquisition	$ 3.2

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