Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease costs	$ 4,111	$ 8,299
Variable and short-term lease costs	1,791	3,259
Total lease costs	$ 5,902	$ 11,558