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Other long-term liabilities
 12 Months Ended
Sep. 30, 2023
Subclassifications of assets, liabilities and equities [abstract]  
Other long-term liabilities Other long-term liabilities
As at
September 30, 2023		 As at
September 30, 2022
$ $
 Deferred revenue 112,370  90,371 
 Deferred compensation plan liabilities (Note 17)
 97,745  81,452 
 Other
 33,477  20,285 
243,592  192,108