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Net finance costs (Tables)
12 Months Ended
Sep. 30, 2025
Analysis of income and expense [abstract]  
Disclosure of finance costs
Year ended September 30
2025 2024
$ $
 Interest on long-term debt 80,907  48,002 
 Interest on lease liabilities 30,461  29,234 
 Net interest costs on net defined benefit pension plans (Note 17)
7,653  7,563 
 Other finance costs 9,556  6,135 
 Finance costs 128,577  90,934 
 Finance income (44,885) (63,045)
83,692  27,889