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Equity - Shares of Common Stock Outstanding (Details) - shares
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Common Class A      
Common Stock, Shares Outstanding [Roll Forward]      
Outstanding, beginning of period (in shares) 27,367,477 23,139,476 19,036,504
Restricted stock granted (in shares) 118,859 177,585 235,219
Shares issued due to option exercise, (in shares)     233,495
Shares issued in connection with RAPM acquisition (in shares)     27,240
Shares issued in connection with offering (in shares) 2,451,633 4,141,921 3,834,686
Shares issued in connection with contingent compensation payment (in shares) 7,692 11,380  
Shares issued in connection with ESPP (in shares) 25,640 7,137  
Shares converted from units (in shares) 0 41,435  
Shares repurchased for employee tax withholdings (in shares) (100,683) (123,928) (186,280)
Forfeitures (in shares) (27,834) (27,529) (41,388)
Outstanding, end of period (in shares) 29,842,784 27,367,477 23,139,476
Common Class B      
Common Stock, Shares Outstanding [Roll Forward]      
Outstanding, beginning of period (in shares) 23,516,439 25,700,068 27,935,255
Restricted stock granted (in shares) 0 0 0
Shares issued due to option exercise, (in shares)     0
Shares issued in connection with RAPM acquisition (in shares)     0
Shares repurchased in connection with offerings (1,466,712) (2,084,617) (2,235,187)
Shares issued in connection with contingent compensation payment (in shares) 0 0  
Shares issued in connection with ESPP (in shares) 0 0  
Shares converted from units (in shares) 0 0  
Shares repurchased for employee tax withholdings (in shares) 0 0 0
Forfeitures (in shares) 0 (99,012) 0
Outstanding, end of period (in shares) 22,049,727 23,516,439 25,700,068