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Financial instruments - Sensitivity analysis (Details) - Currency risk - CAD ($) $ in Thousands | 12 Months Ended
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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)

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