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Other long-term assets
 12 Months Ended
Sep. 30, 2023
Subclassifications of assets, liabilities and equities [abstract]  
Other long-term assets Other long-term assets
As at
September 30, 2023		 As at
September 30, 2022
$ $
 Long-term prepaid services
 28,674  28,720 
 Insurance contracts held to fund defined benefit pension and life assurance arrangements - reimbursement rights (Note 17)
 19,458  18,877 
 Retirement benefits assets (Note 17)
 836  47,071 
 Deposits 15,634  17,189 
 Deferred financing fees 2,531  2,827 
 Other 17,643  24,982 
84,776  139,666