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SHARE-BASED PAYMENTS - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Mar. 31, 2019 CAD ($) Retirement_Plan $ / shares shares | Mar. 31, 2018 CAD ($) $ / shares shares | Mar. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Allocation of recognized period costs, capitalized amount | $ | $ 0.8 | $ 0.4 |
Subscription price, percentage | 100.00% |  |
Not exercisable options, grant date, period | 12 months |  |
Exercisable options, grant date, period | 4 years |  |
Share-based payments | $ | $ 18.9 | $ 17.8 |
Employee Stock Option Plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares (in shares) | shares | 13,446,114 | 14,677,714 |
Weighted average market share price | $ / shares | $ 27.11 | $ 22.15 |
Share-based payments | $ | $ 6.4 | $ 4.9 |
Employee Stock Purchase Plan (ESPP) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Employer matching contribution, matching, percentage | 50.00% |  |
Employer matching contribution, percent of employees' gross pay | 3.00% |  |
Executive Deferred Share Unit (EDSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of days prior to incentive compensation, payable to executives | 5 days |  |
Value of executive deferred share unit (edsu), shares | shares | 1 |  |
Deferred Share Unit (DSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Value of deferred share unit (dsu), shares | shares | 1 |  |
Number of days prior to issuance of deferred shares units | 10 days |  |
Long Term Incentive Time Based Plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of long-term incentive time based plans | Retirement_Plan | 2 |  |
Value of long-term incentive time based plans, shares (in shares) | shares | 1 |  |
Number of long-term incentive time based plans no longer granted | Retirement_Plan | 1 |  |
Long-Term Incentive – Deferred Share Unit Plan (LTI-DSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 5 years |  |
Long-Term Incentive – Time Based Restricted Share Unit Plan (LTI-TB RSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
Long-Term Incentive – Restricted Share Unit Plan (LTI-RSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 33.00% |  |
Long-Term Incentive – Performance Share Unit Plan (LTI-PSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
Equity swap agreements |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Hedging recovery, recognized | $ | $ 13.2 | $ 8.0 |
Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercisable options, period | 7 years |  |
Top of range | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Performance criteria, percentage | 200.00% |  |
Bottom of range | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Performance criteria, percentage | 0.00% |  |
Year 1 | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period |  |  | 1 year
Vesting period |  |  | 16.00%
Year 2 | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period |  | 2 years |
Vesting period |  | 33.00% |
Year 3 | Long-Term Incentive – Performance Share Unit Plan (LTI-PSU) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
Vesting period | 50.00% |  |

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