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Financial instruments - Disclosure of analysis of age of trade accounts receivable (Details) - Trade accounts receivable - CAD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 1,106,187 $ 938,417
Cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,109,647 942,145
Cost | Not past due    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 950,928 818,520
Cost | Past due 1-30 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 81,000 47,702
Cost | Past due 31-60 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 25,694 21,582
Cost | Past due 61-90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 12,142 7,402
Cost | Past due more than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 39,883 46,939
Allowance for doubtful accounts    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ (3,460) $ (3,728)