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Accounts receivable (Details) - CAD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Subclassifications of assets, liabilities and equities [abstract]    
Trade (Note 31) $ 1,106,187 $ 938,417
R&D and other tax credits 163,608 187,347
Other 93,750 105,688
Total accounts receivable $ 1,363,545 $ 1,231,452