Income Taxes (Schedule of Income (Loss) before Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Taxes [Line Items]
Income (loss) before income taxes	$ (106,001)	$ (147,397)	$ (1,090,851)
Federal [Member]
Income Taxes [Line Items]
Income (loss) before income taxes	(129,858)	(145,328)	(1,091,272)
Foreign [Member]
Income Taxes [Line Items]
Income (loss) before income taxes	$ 23,857	$ (2,069)	$ 421