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Share-based payments - Disclosure of share-based payment expense (Details) - CAD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based payment expense $ 264,403 $ 254,213
PSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based payment expense 68,636 67,054
Stock options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based payment expense 0 786
Share purchase plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based payment expense 196,510 181,989
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based payment expense $ (743) $ 4,384