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SHARE-BASED PAYMENTS - ESOP Activity (Details) - Employee Stock Option Plan
12 Months Ended
Mar. 31, 2018
CAD ($)
shares
Mar. 31, 2017
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Options outstanding, beginning of year (in shares) | shares 5,541,625 4,834,725
Granted (in shares) | shares 2,044,900 2,073,600
Exercised (in shares) | shares (1,246,575) (1,029,725)
Forfeited (in shares) | shares (184,425) (336,975)
Options outstanding, end of year (in shares) | shares 6,155,525 5,541,625
Exercisable (in shares) | shares 1,744,125 1,483,450
Options outstanding, beginning of year | $ $ 14.51 $ 13.30
Granted | $ 22.15 16.19
Exercised | $ 12.58 12.25
Forfeited | $ 18.52 14.50
Options outstanding, end of year | $ 17.31 14.51
Exercisable | $ $ 14.12 $ 12.57