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Revenue - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]          
Previously deferred incentive fees recognized during the period       $ 2,541  
Contract asset related to the cost to obtain contracts $ 973   $ 973   $ 968
Contract asset amortization expense $ 120 $ 111 $ 363 $ 347