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Business Segments Information - Schedule of Financial Information Attributable to Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2026 | Jun. 30, 2025
Segment Reporting [Line Items] |  |
Net sales | $ 1,001,112 | $ 829,880
Cost of goods sold | 593,065 | 499,442
Depreciation and Amortization | 62,157 | 50,228
Capital Expenditures | 57,151 | 52,598
Depreciation and amortization | 62,157 | 50,228
Stormwater |  |
Segment Reporting [Line Items] |  |
Net sales | 809,376 | 651,527
Wastewater |  |
Segment Reporting [Line Items] |  |
Net sales | 191,736 | 178,353
Operating Segments | Stormwater |  |
Segment Reporting [Line Items] |  |
Net sales | 820,942 | 660,603
Cost of goods sold | 518,812 | 427,119
Capital Expenditures | 42,504 | 40,602
Depreciation and amortization | 40,504 | 28,896
Operating Segments | Wastewater |  |
Segment Reporting [Line Items] |  |
Net sales | 208,920 | 194,962
Cost of goods sold | 104,600 | 97,251
Capital Expenditures | 14,356 | 5,735
Depreciation and amortization | 18,867 | 19,254
Operating Segments | Other Operating Segment |  |
Segment Reporting [Line Items] |  |
Capital Expenditures | 291 | 6,261
Depreciation and amortization | $ 2,786 | $ 2,078

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