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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Income Tax Contingency [Line Items]        
Valuation allowance $ 37,969,000   $ 37,164,000  
Deferred tax asset 150,309,000   126,219,000  
Liability related to tax receivable agreement 98,956,000   69,636,000  
Net change in valuation allowance 805,000      
Unrecognized tax positions 0   0 $ 0
Foreign Tax Authority        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards 6,902,000   7,999,000  
TRA Recipients | Tax Receivable Agreement        
Income Tax Contingency [Line Items]        
Liability related to tax receivable agreement 98,956,000   69,636,000  
TRA payment 1,952,000      
Additional estimated payable 10,589,000      
Net Operating Loss Carryforwards        
Income Tax Contingency [Line Items]        
Valuation allowance 768,000   $ 947,000  
Deferred Tax Asset, September 2019 Offering        
Income Tax Contingency [Line Items]        
Valuation allowance 3,736,000      
Deferred tax asset   $ 37,394,000    
Deferred Tax Asset, September 2019 Offering | Tax Receivable Agreement        
Income Tax Contingency [Line Items]        
Liability related to tax receivable agreement $ 31,481,000