Accounts Receivable, Deferred Revenue and Performance Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Contract With Customer, Liability [Roll Forward]
Deferred revenue, beginning of period	$ 299,854	$ 255,386	$ 316,327	$ 271,597
Billings	141,798	123,644	287,910	248,443
Revenue recognized	(166,054)	(145,815)	(328,639)	(286,825)
Deferred revenue, end of period	$ 275,598	$ 233,215	$ 275,598	$ 233,215