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Capital stock - Schedule of Dividend (Details) - CAD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2025
Sep. 30, 2024
Disclosure of classes of share capital [abstract]                    
Dividends declared (in CAD per share) $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0 $ 0 $ 0 $ 0    
Dividends paid $ 33,282 $ 33,580 $ 34,057 $ 34,133 $ 0 $ 0 $ 0 $ 0 $ 135,052 $ 0