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Share-based Compensation - Schedule of Fair Value Assumptions (Details) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate   1.60%  
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 35.90%    
Risk-free interest rate 0.10%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 55.50%    
Risk-free interest rate 1.60%    
2019 Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield $ 0 $ 0  
Expected volatility   35.90%  
Expected term (years) 6 months 6 months  
Management Incentive Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield   $ 0 $ 0
Management Incentive Unit | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility   35.00% 50.00%
Expected term (years)   6 months 1 year
Risk-free interest rate   1.86% 2.33%
Management Incentive Unit | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility   55.00% 60.00%
Expected term (years)   1 year 3 months 1 year 6 months
Risk-free interest rate   2.09% 2.40%
Appreciation Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield   $ 0 $ 0
Appreciation Unit | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility   35.00% 50.00%
Expected term (years)   6 months 1 year
Risk-free interest rate   1.86% 2.33%
Appreciation Unit | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility   55.00% 60.00%
Expected term (years)   1 year 3 months 1 year 6 months
Risk-free interest rate   2.09% 2.40%
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield $ 0 $ 0  
Expected term (years) 6 years 1 month 6 days 6 years 1 month 6 days  
Stock Options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 39.30% 37.10%  
Risk-free interest rate 0.40% 0.80%  
Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 39.80% 38.90%  
Risk-free interest rate 1.10% 1.90%