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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]      
Expected tax provision at statutory income tax rates $ 65,945 $ 97,590 $ 27,568
Income taxes at different rates 61,296 88,760 (5,592)
Research and development tax credits (5,957) (3,844) (4,692)
Executive compensation 4,683 4,821 1,582
Stock-based compensation (9,141) (3,161) (2,735)
Deferred tax effects from TRAF 0 1,944 (206,792)
Valuation allowance 887 (247) (538)
Restructuring charges / (credits) 0 (5) 12
Unrecognized tax benefits 16,577 15,978 64,683
Audit settlement (3,655) 0 0
Other, net 670 (973) 1,107
Provision for (benefit from) income taxes $ 131,305 $ 200,863 $ (125,397)