Leases - Summary of Components of Operating Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Leases [Abstract]
Operating lease costs	$ 9,558
Short-term lease costs	102
Variable lease costs	827
Less: Sublease income	(178)
Total operating lease costs	$ 10,309	$ 8,174	$ 7,551