Leases (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Amortization of right-of-use assets	$ 443	$ 0	$ 768	$ 0
Interest on lease liabilities	59	0	109	0
Operating lease cost	1,692	2,242	3,389	3,458
Short term lease cost	22	27	45	50
Variable lease cost	12,303	15,696	24,010	32,295
Sublease income	(55)	(860)	(109)	(1,774)
Total net lease cost	$ 14,464	$ 17,105	$ 28,212	$ 34,029