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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Expected tax provision at statutory income tax rates | $ 23,046 | $ 19,743 | $ 18,274
Income taxes at different rates | (10,113) | (9,611) | (5,247)
Research and development tax credits | (5,432) | (4,124) | (2,309)
Executive compensation | 3,344 | 1,835 | 654
Stock-based compensation | (7,288) | (9,376) | 1,794
Deferred tax effects from Tax Act | 0 | 22,325 | 0
Valuation allowance | 1,891 | 533 | 1,024
Restructuring charges / (credits) | 961 | (10) | 2
Tax reserves (releases), net | 8,269 | 3,627 | (5,570)
Other, net | (1,118) | (1,219) | 491
Provision for income taxes | $ 13,560 | $ 23,723 | $ 9,113

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible executive compensation + References No definition available. + Details
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