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Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income tax rate	21.00%	21.00%	21.00%
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense at U.S. federal statutory income tax rate	$ 32,532	$ 18,893	$ 15,048
State and local tax expense (benefit)	306	1,421	(3,065)
Foreign tax rate differential	3,318	1,770	3,181
U.S. effects of foreign branch income	8,662	1,519	11,016
Non-deductible expenses	1,742	1,216	898
Tax credits	(41,740)	(26,457)	(27,983)
GILTI inclusion and FDII deduction	(13,905)	(10,938)	(2,708)
Employee compensation	(7,188)	5,528	(17,180)
Changes in uncertain tax positions	(14,835)	10,978	501
Changes in valuation allowance	13,080	(32,629)	32,026
Foreign withholding tax	18,469	12,598	9,312
Effects of changes in tax laws	(186)	382	(859)
Inflation and currency related adjustments	851	(1,518)	(592)
Other adjustments	(823)	(755)	(387)
Total income tax expense (benefit)	$ 283	$ (17,992)	$ 19,208

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