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SHARE-BASED PAYMENTS - ESOP Summarized (Details) - Employee Stock Option Plan | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 CAD ($) shares | Mar. 31, 2018 CAD ($) shares | Mar. 31, 2017 CAD ($) shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 6,504,125 | 6,155,525 | 5,541,625
Weighted average remaining contractual life | 4 years 8 months 5 days |  |
Weighted average exercise price | $ 20.41 | $ 17.31 | $ 14.51
Exercisable (in shares) | shares | 2,082,325 | 1,744,125 |
Exercisable | $ 16.36 | $ 14.12 |
$9.69 to $11.02 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 179,725 |  |
Weighted average remaining contractual life | 11 months 1 day |  |
Weighted average exercise price | $ 10.76 |  |
Exercisable (in shares) | shares | 179,725 |  |
Exercisable | $ 10.76 |  |
$14.61 to $16.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 2,755,125 |  |
Weighted average remaining contractual life | 3 years 7 months 17 days |  |
Weighted average exercise price | $ 15.65 |  |
Exercisable (in shares) | shares | 1,496,500 |  |
Exercisable | $ 15.47 |  |
$20.86 to $27.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share options outstanding | shares | 3,569,275 |  |
Weighted average remaining contractual life | 5 years 8 months 5 days |  |
Weighted average exercise price | $ 24.56 |  |
Exercisable (in shares) | shares | 406,100 |  |
Exercisable | $ 22.14 |  |
Bottom of range | $9.69 to $11.02 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 9.60 |  |
Bottom of range | $14.61 to $16.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 12.65 |  |
Bottom of range | $20.86 to $27.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 20.86 |  |
Top of range | $9.69 to $11.02 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 11.02 |  |
Top of range | $14.61 to $16.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | 14.66 |  |
Top of range | $20.86 to $27.15 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price | $ 22.26 |  |

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