SHARE CAPITAL AND EARNINGS PER SHARE - Narrative (Details) - CAD ($) $ / shares in Units, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Jun. 06, 2025 |
|
| Share Capital, Reserves And Other Equity Interest [Abstract] | |||
| Number of shares issued and fully paid (in shares) | 321,734,387 | 320,265,108 | |
| Share repurchase program, authorized (in shares) | 16,019,294 | ||
| Repurchase and cancellation of common shares (in shares) | 191,100 | 856,230 | |
| Weighted average share price (in CAD per share) | $ 36.52 | $ 24.85 | |
| Payments to acquire or redeem entity's shares | $ 7.0 | $ 21.3 | |
| Number of potential ordinary shares that are antidilutive in period presented (in shares) | 0 | 1,637,584 | |