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SHARE-BASED PAYMENTS - ESOP Activity (Details) - Employee Stock Option Plan
 12 Months Ended
Mar. 31, 2020
CAD ($)
shares
Mar. 31, 2019
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Options outstanding, beginning of year (in shares) | shares 6,504,125 6,155,525
Granted (in shares) | shares 1,320,700 1,733,100
Exercised (in shares) | shares (1,553,846) (1,231,600)
Forfeited (in shares) | shares (196,825) (82,525)
Expired (in shares) | shares (23,300) (70,375)
Options outstanding, end of year (in shares) | shares 6,050,854 6,504,125
Exercisable (in shares) | shares 2,187,379 2,082,325
Options outstanding, beginning of year | $ $ 20.41 $ 17.31
Granted | $ 34.50 27.15
Exercised | $ 17.06 14.78
Forfeited | $ 24.17 17.41
Expired | $ 10.06 18.20
Options outstanding, end of year | $ 24.25 20.41
Exercisable | $ $ 19.05 $ 16.36