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Long-term financial assets
 12 Months Ended
Sep. 30, 2022
Subclassifications of assets, liabilities and equities [abstract]  
Long-term financial assets Long-term financial assets
As at
September 30, 2022		 As at
September 30, 2021
$ $
 Deferred compensation plan assets (Notes 17 and 31)
 71,863  81,633 
 Long-term investments (Note 31)
 16,826  19,354 
 Long-term receivables
 10,590  18,093 
 Long-term derivative financial instruments (Note 31)
 237,877  33,578 
337,156  152,658