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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]      
Expected tax provision at statutory income tax rates $ 19,743 $ 18,274 $ 11,175
Income taxes at different rates (9,611) (5,247) (2,713)
Research and development tax credits (4,124) (2,309) (1,619)
Executive compensation 1,835 654 864
Stock-based compensation (9,376) 1,794 1,446
Deferred tax effects from Tax Act 22,325 0 0
Valuation allowance 533 1,024 947
Restructuring charges / (credits) (10) 2 1,514
Tax reserves (releases), net 3,627 (5,570) (8,761)
Other, net (1,219) 491 257
Provision for income taxes $ 23,723 $ 9,113 $ 3,110