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SHARE CAPITAL AND EARNINGS PER SHARE - Narrative (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | May 27, 2024
Share Capital, Reserves And Other Equity Interest [Abstract] |  |  |
Number of shares issued and fully paid (in shares) | 320,265,108 | 318,312,233 |
Share repurchase program, authorized (in shares) |  |  | 15,932,187
Repurchase and cancellation of common shares (in shares) | 856,230 |  |
Weighted average share price (in CAD per share) | $ 24.85 |  |
Payments to acquire or redeem entity's shares | $ 21.3 | $ 0.0 |
Number of potential ordinary shares that are antidilutive in period presented (in shares) | 1,637,584 | 6,459,922 |

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