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Long-term debt - Narrative (Details) - CAD ($)	Oct. 30, 2024	Sep. 30, 2024	Sep. 30, 2023
Disclosure of detailed information about borrowings [line items]
Borrowings		$ 2,688,308,000	$ 3,100,321,000
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		$ 3,645,000
Unsecured committed revolving credit facility \| Extension of uncommitted RCF
Disclosure of detailed information about borrowings [line items]
Borrowings, extension period	1 year