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v3.25.1

Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Cost | $ 582,523 | $ 554,565
Intangible Assets, Accumulated Amortization | (104,805) | (96,406)
Goodwill, Cost | 392,569 | 380,711
Goodwill, Additions | 77,325 | 11,858
Goodwill, Net | 469,894 | 392,569
Goodwill and Intangible Assets, Additions | 118,034 | 27,958
Goodwill and Intangible Assets, net | $ 595,752 | $ 486,117
Minimum [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Useful Life |  | 25 years
Maximum [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Useful Life |  | 40 years
Customer Contracts And Relationships [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Useful Life | 15 years | 15 years
Intangible Assets, Cost | $ 157,294 | $ 141,194
Intangible Assets, Additions | 40,209 | 16,100
Intangible Assets, Accumulated Amortization | (89,444) | (82,077)
Intangible Assets, Net | 108,059 | 75,217
Permits [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Cost | 30,760 | 30,760
Intangible Assets, Additions | 0 | 0
Intangible Assets, Accumulated Amortization | (14,358) | (13,413)
Intangible Assets, Net | $ 16,402 | $ 17,347
Permits [Member] | Minimum [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Useful Life | 25 years |
Permits [Member] | Maximum [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Useful Life | 40 years |
Trade Name [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible Assets, Useful Life | 15 years | 15 years
Intangible Assets, Cost | $ 1,900 | $ 1,900
Intangible Assets, Additions | 500 | 0
Intangible Assets, Accumulated Amortization | (1,003) | (916)
Intangible Assets, Net | $ 1,397 | $ 984

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