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Long-term debt - Narrative (Details) - CAD ($)
Nov. 01, 2022
Sep. 30, 2022
Sep. 30, 2021
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 3,267,034,000 $ 3,401,656,000
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   $ 4,270,000  
Borrowings, extension period 1 year