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Net finance costs (Tables)
12 Months Ended
Sep. 30, 2024
Analysis of income and expense [abstract]  
Disclosure of finance costs
Year ended September 30
2024 2023
$ $
 Interest on long-term debt 48,002  53,871 
 Interest on lease liabilities 29,234  29,115 
 Net interest costs on net defined benefit pension plans (Note 17)
7,563  4,782 
 Other finance costs 6,135  6,192 
 Finance costs 90,934  93,960 
 Finance income (63,045) (41,497)
27,889  52,463