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Long-term debt - Narrative (Details) - CAD ($)
Oct. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 3,637,835,000 $ 2,688,308,000
Unsecured committed revolving credit facility      
Disclosure of detailed information about borrowings [line items]      
Borrowings, capacity of unsecured credit facility   1,500,000,000  
Borrowings   0  
Collateral amount against facility to cover letters of credits   $ 3,752,000  
Unsecured committed revolving credit facility | Extension of uncommitted RCF      
Disclosure of detailed information about borrowings [line items]      
Borrowings, extension period 1 year