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SHARE-BASED PAYMENTS - ESOP Summarized (Details) - Employee Stock Option Plan | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 CAD ($) shares | Mar. 31, 2017 CAD ($) shares | Mar. 31, 2016 CAD ($) shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 6,155,525 | 5,541,625 | 4,834,725
Weighted average remaining contractual life | 4 years 9 months 22 days |  |
Weighted average exercise price | $ 17.31 | $ 14.51 | $ 13.30
Exercisable (in shares) | shares | 1,744,125 | 1,483,450 |
Exercisable | $ 14.12 | $ 12.57 |
$9.60 to $11.02 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 415,900 |  |
Weighted average remaining contractual life | 1 year 10 months 14 days |  |
Weighted average exercise price | $ 10.76 |  |
Exercisable (in shares) | shares | 415,900 |  |
Exercisable | $ 10.76 |  |
$12.65 to $14.66 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 813,625 |  |
Weighted average remaining contractual life | 3 years 22 days |  |
Weighted average exercise price | $ 14.60 |  |
Exercisable (in shares) | shares | 529,525 |  |
Exercisable | $ 14.58 |  |
$15.00 to $16.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 2,947,000 |  |
Weighted average remaining contractual life | 4 years 9 months 11 days |  |
Weighted average exercise price | $ 15.74 |  |
Exercisable (in shares) | shares | 798,700 |  |
Exercisable | $ 15.58 |  |
$20.86 to $22.26 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 1,979,000 |  |
Weighted average remaining contractual life | 6 years 2 months 12 days |  |
Weighted average exercise price | $ 22.15 |  |
Exercisable (in shares) | shares | 0 |  |
Exercisable | $ 0.00 |  |
Bottom of range | $9.60 to $11.02 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 9.60 |  |
Bottom of range | $12.65 to $14.66 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 12.65 |  |
Bottom of range | $15.00 to $16.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 15.00 |  |
Bottom of range | $20.86 to $22.26 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 20.86 |  |
Top of range | $9.60 to $11.02 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 11.02 |  |
Top of range | $12.65 to $14.66 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 14.66 |  |
Top of range | $15.00 to $16.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 16.15 |  |
Top of range | $20.86 to $22.26 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | $ 22.26 |  |

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