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Other long-term assets (Tables)
12 Months Ended
Sep. 30, 2022
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of other long-term assets
As at
September 30, 2022
As at
September 30, 2021
$ $
 Prepaid long-term maintenance agreements 28,720  32,019 
 Insurance contracts held to fund defined benefit pension and life assurance arrangements - reimbursement rights (Note 17)
18,877  21,250 
 Retirement benefits assets (Note 17)
47,071  106,228 
 Deposits 22,595  15,641 
 Deferred financing fees 2,827  2,533 
 Other 19,576  13,841 
139,666  191,512