Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Federal	$ 198,307	$ 3,213	$ (393)
State	47,992	575	1,198
Foreign	12,468	5,920	11,638
Total current tax position	258,767	9,708	12,443
Federal	(50,086)	(29,021)	(72,336)
State	(5,839)	(5,464)	(990)
Foreign	(3,351)	1,060	(114)
Total deferred tax provision	(59,276)	(33,425)	(73,440)
Total income tax expense (benefit)	$ 199,491	$ (23,717)	$ (60,997)