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Financial instruments - Disclosure of analysis of age of trade accounts receivable (Details) - CAD ($)
Sep. 30, 2024
Sep. 30, 2023
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables $ 1,117,712,000 $ 1,152,880,000
Cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 1,120,772,000 1,155,799,000
Cost | Not past due    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 1,005,651,000 1,034,795,000
Cost | Past due 1-30 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 71,445,000 82,536,000
Cost | Past due 31-60 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 18,352,000 17,630,000
Cost | Past due 61-90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 11,957,000 9,925,000
Cost | Past due more than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 13,367,000 10,913,000
Allowance for doubtful accounts    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables $ (3,060,000) $ (2,919,000)