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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
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