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SHARE-BASED PAYMENTS - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2024 CAD ($) category $ / shares shares | Mar. 31, 2023 CAD ($) $ / shares shares | Aug. 31, 2023 instrument
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of instruments reserved for issuance in share-based arrangement (in instruments) | instrument |  |  | 10,000,000
Number of categories | category | 2 |  |
Expense from share-based payment transactions with employees | $ | $ 34.5 | $ 28.5 |
Weighted average market share price for stock options (in dollars per share) | $ / shares | $ 30.33 | $ 31.95 |
Shares vested and outstanding, granted under previous plans (in shares) | shares | 833,090 | 850,392 |
Number of trading days (in days) | 20 days |  |
Cash-settled award vesting period (in years) | 3 years |  |
Discontinued operations |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expense from share-based payment transactions with employees | $ | $ 2.8 | $ 0.8 |
Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercisable options (in years) | 4 years |  |
Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercisable options (in years) | 7 years |  |
Stock option plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average fair value of stock options (in dollars per share) | $ / shares | $ 10.12 | $ 10.85 |
Cash-settled PSU | Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cash-settled share-based payment arrangement factor percentage (in percent) | 0.00% |  |
Cash-settled PSU | Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cash-settled share-based payment arrangement factor percentage (in percent) | 200.00% |  |
Stock purchase plan |  |  |
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 (in percent) | 3.00% |  |
Equity-settled RSU |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Equity-settled award vesting period (in years) | 3 years |  |
Equity-settled PSU |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Equity-settled award vesting period (in years) | 3 years |  |
Equity-settled PSU | Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Equity-settled share-based payment arrangement factor percentage (in percent) | 0.00% |  |
Equity-settled PSU | Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Equity-settled share-based payment arrangement factor percentage (in percent) | 200.00% |  |
Cash-settled DSU |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of days prior to date of incentive becoming payable (in days) | 5 days |  |

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