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Financial instruments - Disclosure of analysis of age of trade accounts receivable (Details) - CAD ($)
Sep. 30, 2025
Sep. 30, 2024
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables $ 1,343,282,000 $ 1,117,712,000
Cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 1,349,436,000 1,120,772,000
Cost | Not past due    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 1,195,658,000 1,005,651,000
Cost | Past due 1-30 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 92,167,000 71,445,000
Cost | Past due 31-60 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 24,089,000 18,352,000
Cost | Past due 61-90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 11,284,000 11,957,000
Cost | Past due more than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables 26,238,000 13,367,000
Allowance for doubtful accounts    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables $ (6,154,000) $ (3,060,000)