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Share-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Option [Member] - 2015 EIP [Member] - $ / shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding at March 31, 2020 8,176,814  
Options Granted 1,482,604  
Options Forfeited/Canceled (270,047)  
Stock options outstanding at March 31, 2021 9,389,371 8,176,814
Stock options exercisable 5,533,848  
Weighted average exercise price, Beginning balance $ 24.52  
Weighted average exercise price, Granted 38.71  
Weighted average exercise price,Forfeited/Canceled 29.89  
Weighted average exercise price, Ending balance 26.61 $ 24.52
Weighted average exercise price, exercisable 21.52  
Weighted Average Grant Date Fair Value, Beginning balance 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