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Accounts receivable (Details) - CAD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Subclassifications of assets, liabilities and equities [abstract]    
Trade (Note 32) $ 1,152,880 $ 1,106,187
R&D and other tax credits 157,668 163,608
Discount incentives 57,714 47,906
Other 56,855 45,844
Total accounts receivable $ 1,425,117 $ 1,363,545