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Net finance costs (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Analysis of income and expense [abstract]    
Interest on long-term debt $ 57,752 $ 67,467
Interest on lease liabilities 27,426 33,255
Net interest costs on net defined benefit obligations or assets (Note 17) 1,626 2,413
Other finance costs 8,413 6,774
Finance costs 95,217 109,909
Finance income (3,194) (3,111)
Net finance costs $ 92,023 $ 106,798