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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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