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Financial instruments - Disclosure of analysis of age of trade accounts receivable (Details) - CAD ($)
Sep. 30, 2023
Sep. 30, 2022
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables $ (1,152,880,000) $ (1,106,187,000)
Gross trade receivables 1,155,799,000 1,109,647,000
Allowance for doubtful accounts (2,919,000) (3,460,000)
Not past due    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables (1,034,795,000) (950,928,000)
Past due 1-30 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables (82,536,000) (81,000,000)
Past due 31-60 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables (17,630,000) (25,694,000)
Past due 61-90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables (9,925,000) (12,142,000)
Past due more than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables $ (10,913,000) $ (39,883,000)