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Financial instruments - Sensitivity analysis (Details) - Currency risk - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
euro impact |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in net earnings | $ 1,384 | $ 2,835
Decrease in other comprehensive income (loss) | (155,000) | (183,986)
U.S. dollar impact |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in net earnings | 3,598 | 3,604
Decrease in other comprehensive income (loss) | (190,539) | (179,780)
British pound impact |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in net earnings | 692 | 622
Decrease in other comprehensive income (loss) | (29,436) | (31,700)
Swedish krona impact |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in net earnings | 466 | 883
Decrease in other comprehensive income (loss) | $ (7,005) | $ (8,577)

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