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Financial instruments - Sensitivity analysis (Details) - Currency risk - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
euro impact |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in net earnings | $ 2,835 | $ 1,294
Decrease in other comprehensive loss | (183,986) | (83,334)
U.S. dollar impact |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in net earnings | 3,604 | 1,416
Decrease in other comprehensive loss | (179,780) | (187,587)
British pound impact |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in net earnings | 622 | 1,227
Decrease in other comprehensive loss | (31,700) | (25,622)
Swedish krona impact |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in net earnings | 883 | 171
Decrease in other comprehensive loss | $ (8,577) | $ (8,287)

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