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Other long-term assets
 12 Months Ended
Sep. 30, 2025
Subclassifications of assets, liabilities and equities [abstract]  
Other long-term assets Other long-term assets
As at
September 30, 2025		 As at
September 30, 2024
$ $
Long-term prepaid services 29,169  24,061 
Insurance contracts held to fund defined benefit pension and life assurance
arrangements - reimbursement rights (Note 17)
 20,139  19,675 
Retirement benefits assets (Note 17)
 55,156  22,446 
Deposits 18,609  13,503 
Deferred financing fees 2,434  2,425 
Other 17,813  28,330 
143,320  110,440