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Accounts receivable (Details) - CAD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Subclassifications of assets, liabilities and equities [abstract]    
Trade (Note 32) $ 1,343,282 $ 1,117,712
Tax credits and R&D tax credits 167,599 149,955
Other 102,896 130,735
Total accounts receivable $ 1,613,777 $ 1,398,402