OTHER NON-CURRENT LIABILITIES (Details) - CAD ($) $ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Contract liabilities (Note 11) | $ 144.0 | $ 126.8 |
| Share-based payments liabilities (Note 25) | 22.0 | 40.3 |
| Royalty obligations | 54.5 | 66.1 |
| Other | 25.5 | 35.2 |
| Other non-current liabilities | $ 246.0 | $ 268.4 |