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Share-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Option [Member] - 2015 EIP [Member] - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding ,Beginning balance 9,389,371 8,176,814  
Options Granted 3,798,605 1,482,604  
Options Forfeited/Canceled (106,428) (270,047)  
Stock options outstanding , Ending balance 13,081,548 9,389,371 8,176,814
Stock options exercisable   5,533,848  
Weighted average exercise price, Beginning balance $ 26.61 $ 24.52  
Weighted average exercise price, Granted 29.26 38.71  
Weighted average exercise price,Forfeited/Canceled 30.27 29.89  
Weighted average exercise price, Ending balance 27.35 26.61 $ 24.52
Weighted average exercise price, exercisable   21.52  
Weighted Average Grant Date Fair Value, Beginning balance $ 17.90 16.53  
Weighted average grant date fair value, Granted   25.37  
Weighted Average Grant Date Fair Value, Granted   19.85  
Weighted Average Grant Date Fair Value, Ending balance   17.90 $ 16.53
Weighted Average Grant Date Fair Value, exercisable   $ 14.95  
Weighted Average Remaining Contractual Life   7 years 3 months 3 days 7 years 11 months 4 days
Weighted Average Remaining Contractual Life, exercisable   6 years 5 months 26 days