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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Expected tax provision at statutory income tax rates	$ 97,590	$ 27,568	$ 23,046
Income taxes at different rates	88,760	(5,592)	(10,113)
Research and development tax credits	(3,844)	(4,692)	(5,432)
Executive compensation	4,821	1,582	3,344
Stock-based compensation	(3,161)	(2,735)	(7,288)
Deferred tax effects from TRAF	1,944	(206,792)	0
Valuation allowance	(247)	(538)	1,891
Restructuring charges / (credits)	(5)	12	961
Unrecognized tax benefits	15,978	64,683	8,269
Other, net	(973)	1,107	(1,118)
Provision for (benefit from) income taxes	$ 200,863	$ (125,397)	$ 13,560

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Effective Income Tax Rate Reconciliation, Effect of Federal Act on Tax Reform and AVS Financing

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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