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Income Taxes - Reconciliation of Income Taxes at Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
United States statutory income tax expense	$ 85,381	$ 61,358	$ 44,233
State income taxes, net of federal effect	7,361	(995)	1,714
Nondeductible expenses and other	14,135	3,833	6,028
Net effect of GILTI, FDII, BEAT	3,322	3,313	2,457
Effect of foreign operations	(14,074)	(17,475)	(12,978)
Valuation allowance	(4,270)	6,849	2,068
Research and Development Credit	(5,652)	(5,158)	(5,063)
AMPC Impact	(38,764)	(28,636)	(3,630)
Tax Act	(4,597)	0	0
Total income tax expense	$ 42,842	$ 23,089	$ 34,829

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