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Net finance costs
12 Months Ended
Sep. 30, 2023
Analysis of income and expense [abstract]  
Net finance costs Net finance costs
Year ended September 30
2023 2022
$ $
 Interest on long-term debt 53,871  57,752 
 Interest on lease liabilities 29,115  27,426 
 Net interest costs on net defined benefit obligations or assets (Note 17)
4,782  1,626 
 Other finance costs 6,192  8,413 
 Finance costs 93,960  95,217 
 Finance income (41,497) (3,194)
52,463  92,023