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Share-Based Compensation - Summary of Performance Options Activity (Detail) - Performance Options [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 14,425,663 14,518,870  
Options Granted 0 0  
Options Forfeited 0 (93,207)  
Stock options outstanding , Ending balance 14,425,663 14,425,663 14,518,870
Weighted average exercise price, Beginning balance $ 38.93 $ 38.97  
Weighted average exercise price, Granted 0 0  
Weighted average exercise price, Forfeited 0 46.38  
Weighted average exercise price, Ending balance 38.93 38.93 $ 38.97
Weighted average grant date fair value, Beginning balance $ 23.42 23.78  
Weighted average grant date fair value, Granted   0  
Weighted average grant date fair value, Forfeited   22.18  
Weighted average grant date fair value, Ending balance   $ 23.42 $ 23.78
Performance Options outstanding at March 31, 2020   5 years 6 years