Revenue - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract asset related to the cost to obtain contracts	$ 964	$ 994
Contract asset amortization expense	526	504	$ 480
Incentive fees
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Previously deferred incentive fees recognized during the period	$ 3,704	$ 2,541