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Revenue Recognition - Schedule of Contract Asset and Liability (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2026
Disaggregation of Revenue [Line Items]
Net sales	$ 1,001,112	$ 829,880
Contract asset - product returns	1,409		$ 1,383
Refund liability	4,912		$ 4,112
Stormwater
Disaggregation of Revenue [Line Items]
Net sales	809,376	651,527
Wastewater
Disaggregation of Revenue [Line Items]
Net sales	191,736	178,353
Domestic Pipe | Stormwater
Disaggregation of Revenue [Line Items]
Net sales	458,088	424,606
Domestic Allied Products | Stormwater
Disaggregation of Revenue [Line Items]
Net sales	303,387	187,506
International | Stormwater
Disaggregation of Revenue [Line Items]
Net sales	59,467	48,491
Operating Segments | Stormwater
Disaggregation of Revenue [Line Items]
Net sales	820,942	660,603
Operating Segments | Wastewater
Disaggregation of Revenue [Line Items]
Net sales	208,920	194,962
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Net sales	(28,750)	(25,685)
Intersegment Eliminations | Stormwater
Disaggregation of Revenue [Line Items]
Net sales	11,566	9,076
Intersegment Eliminations | Wastewater
Disaggregation of Revenue [Line Items]
Net sales	$ 17,184	$ 16,609

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