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Net finance costs (Details) - CAD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Analysis of income and expense [abstract]    
Interest on long-term debt $ 80,907 $ 48,002
Interest on lease liabilities 30,461 29,234
Net interest on net defined benefit obligations or assets 7,653 7,563
Other finance costs 9,556 6,135
Finance costs 128,577 90,934
Finance income (44,885) (63,045)
Net finance costs $ 83,692 $ 27,889