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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Expected tax provision at statutory income tax rates	$ 60,084	$ 52,836	$ 39,399
Income taxes at different rates	68,212	47,595	38,467
Research and development tax credits	(6,797)	(9,738)	(152)
Swiss Tax Benefits	0	(50,051)	0
Executive compensation	980	407	749
Stock-based compensation	(2,162)	4,019	5,736
Deferred tax effects from TRAF	0	(33,926)	0
Valuation allowance	1,000	4,780	908
Impairment	0	0	1,881
Restructuring credits	(817)	0	(1,764)
Unrecognized tax benefits/ Audit resolution and statute lapse	(43,333)	11,535	13,284
FDII deduction	(1,424)	(18,675)	0
Other, net	(400)	671	439
Provision for income taxes	$ 75,343	$ 9,453	$ 98,947

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