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Long-term financial assets (Details) - CAD ($)
Sep. 30, 2023
Sep. 30, 2022
Subclassifications of assets, liabilities and equities [abstract]    
Deferred compensation plan assets $ 88,076,000 $ 71,863,000
Long-term investments 17,113,000 16,826,000
Long-term receivables 20,774,000 10,590,000
Long-term derivative financial instruments 22,005,000 237,877,000
Long-term financial assets $ 147,968,000 $ 337,156,000