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Long-term financial assets (Details) - CAD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Subclassifications of assets, liabilities and equities [abstract]    
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
Long-term financial assets $ 337,156 $ 152,658