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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Expected tax provision at statutory income tax rates | $ 27,568 | $ 23,046 | $ 19,743
Income taxes at different rates | (5,592) | (10,113) | (9,611)
Research and development tax credits | (4,692) | (5,432) | (4,124)
Executive compensation | 1,582 | 3,344 | 1,835
Stock-based compensation | (2,735) | (7,288) | (9,376)
Deferred tax effects from Tax Act | 0 | 0 | 22,325
Deferred tax effects from TRAF | (206,792) | 0 | 0
Valuation allowance | (538) | 1,891 | 533
Restructuring charges / (credits) | 12 | 961 | (10)
Unrecognized tax benefits | 64,683 | 8,269 | 3,627
Other, net | 1,107 | (1,118) | (1,219)
Provision for (benefit from) income taxes | $ (125,397) | $ 13,560 | $ 23,723

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