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Financial instruments - Sensitivity analysis (Details) - Currency risk - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
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 $ 150 $ 1,384
Decrease in other comprehensive income (loss) (174,239) (155,000)
U.S. dollar impact    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in net earnings 1,359 3,598
Decrease in other comprehensive income (loss) (180,405) (190,539)
British pound impact    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in net earnings 1,179 692
Decrease in other comprehensive income (loss) (17,269) (29,436)
Swedish krona impact    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in net earnings 521 466
Decrease in other comprehensive income (loss) $ (9,631) $ (7,005)