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SHARE-BASED PAYMENTS - ESOP Activity (Details)
 12 Months Ended
Mar. 31, 2021
shares
$ / shares
Mar. 31, 2020
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Granted $ 21.48 $ 33.94
Employee Stock Option Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Options outstanding, beginning of year (in shares) | shares 6,050,854 6,504,125
Granted (in shares) | shares 2,697,713 1,320,700
Exercised (in shares) | shares (687,165) (1,553,846)
Forfeited (in shares) | shares (579,700) (196,825)
Expired (in shares) | shares (4,800) (23,300)
Options outstanding, end of year (in shares) | shares 7,476,902 6,050,854
Exercisable (in shares) | shares 2,934,364 2,187,379
Options outstanding, beginning of year $ 24.25 $ 20.41
Granted 20.65 34.50
Exercised 17.94 17.06
Forfeited 26.28 24.17
Expired 11.02 10.06
Options outstanding, end of year 23.39 24.25
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 21.66 $ 19.05