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Revenue - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Previously deferred incentive fees recognized during the period   $ 2,541 $ 38,921
Contract asset related to the cost to obtain contracts $ 994 968  
Contract asset amortization expense $ 504 $ 480