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Segmented information - Disclosure of PP&E, contract costs and intangible assets information by location (Details) - CAD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | $ 2,178,825 | $ 1,895,542
U.S. |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 676,717 | 656,176
Canada |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 441,218 | 433,965
France |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 276,053 | 182,015
U.K. |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 223,676 | 107,649
Sweden |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 112,744 | 105,491
Finland |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 104,354 | 101,137
GERMANY |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 107,623 | 94,704
India |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 77,772 | 65,185
Netherlands |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | 54,462 | 54,552
Rest of the world |  |
Disclosure of operating segments [line items] |  |
PP&E, contract costs and intangible assets | $ 104,206 | $ 94,668

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