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SHARE-BASED PAYMENTS - ESOP Activity (Details) - Employee Stock Option Plan
 12 Months Ended
Mar. 31, 2019
CAD ($)
shares
Mar. 31, 2018
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Options outstanding, beginning of year (in shares) | shares 6,155,525 5,541,625
Granted (in shares) | shares 1,733,100 2,044,900
Exercised (in shares) | shares (1,231,600) (1,246,575)
Forfeited (in shares) | shares (82,525) (184,425)
Expired (in shares) | shares (70,375) 0
Options outstanding, end of year (in shares) | shares 6,504,125 6,155,525
Exercisable (in shares) | shares 2,082,325 1,744,125
Options outstanding, beginning of year | $ $ 17.31 $ 14.51
Granted | $ 27.15 22.15
Exercised | $ 14.78 12.58
Forfeited | $ 17.41 18.52
Expired | $ 18.20 0.00
Options outstanding, end of year | $ 20.41 17.31
Exercisable | $ $ 16.36 $ 14.12