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Long-term financial assets
 12 Months Ended
Sep. 30, 2023
Subclassifications of assets, liabilities and equities [abstract]  
Long-term financial assets Long-term financial assets
As at
September 30, 2023		 As at
September 30, 2022
$ $
 Deferred compensation plan assets (Notes 17 and 32)
 88,076  71,863 
 Long-term investments (Note 32)
 17,113  16,826 
 Long-term receivables
 20,774  10,590 
 Long-term derivative financial instruments (Note 32)
 22,005  237,877 
147,968  337,156