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Financial instruments - Sensitivity analysis (Details) - Currency risk - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent 10.00%  
euro impact    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in net earnings $ 2,806 $ 150
Decrease in other comprehensive income (loss) (211,271) (174,239)
U.S. dollar impact    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in net earnings 5,827 1,359
Decrease in other comprehensive income (loss) (235,753) (180,405)
British pound impact    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in net earnings 990 1,179
Decrease in other comprehensive income (loss) (22,262) (17,269)
Swedish krona impact    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in net earnings 265 521
Decrease in other comprehensive income (loss) $ (20,296) $ (9,631)