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COMPENSATION OF KEY MANAGEMENT PERSONNEL - Narrative (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2025 CAD ($) officer director | Mar. 31, 2024 CAD ($) officer director
Related party transactions [abstract] |  |
Number of non-employee directors | director | 12 | 12
Number of executive officers | officer | 8 | 5
Executive management transition costs | $ 8.3 |
Costs related to the CEO's terms of departure | 6.3 | $ 0.0
Other costs, primarily external advisor fees | 2.0 |
Compensation earned by non-employee directors | $ 3.9 | $ 3.3

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