v3.26.1
SHARE-BASED PAYMENTS - Carrying Amount of Share Based Payment Liabilities (Details) - CAD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Total carrying amount of share-based payments liabilities $ 33.3 $ 65.6
Current portion 11.3 25.3
Share-based payments liabilities (Note 25) 22.0 40.3
DSU plans    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled plans 33.3 48.7
RSU plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled plans 0.0 6.5
PSU plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled plans $ 0.0 $ 10.4