Income Taxes - Reconciliation of Benefit from (Provision for) Income Taxes to Amount Computed by Applying Statutory Federal Income Tax Rate to (Loss) Income before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Provision Benefit For Income Taxes [Line Items]
Tax (provision) benefit at federal statutory rate	$ 114,512	$ 250,728	$ 34,047
State tax provision, net of federal benefit	8,908	28,621	202
Tax credits	16,004	28,574	23,925
Non-deductible compensation	(2,459)	(5,240)	(3,096)
Non-deductible transaction costs	(40)	(18,911)	(167)
Non-deductible meals and entertainment	(1,112)	(1,077)	(693)
Stock-based compensation	(12,932)	(12,182)	(12,032)
Base Erosion and Anti-Abuse Tax (BEAT)	(30,448)		(8,610)
Foreign effective tax rate differential, net of valuation allowance	(9,185)	6,199	(5,769)
Unremitted subsidiary gains	(7,043)	(1,586)	(887)
Withholding taxes	(6,852)	(4,981)	(1,591)
Other	(7,514)	2,256	(1,605)
Total (provision for) benefit from income taxes	941	139,474	(49,418)
United States [Member]
Provision Benefit For Income Taxes [Line Items]
Change in valuation allowances	(49,566)	(105,968)
State [Member]
Provision Benefit For Income Taxes [Line Items]
Change in valuation allowances	(10,880)	(27,251)	(73,600)
Change in effective tax rate	$ (452)	$ 292	$ 458