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Goodwill - Movements in goodwill (Details) - Goodwill
 12 Months Ended
Sep. 30, 2025
CAD ($)
Reconciliation of changes in goodwill [abstract]  
Beginning balance $ 9,470,376,000
Goodwill reallocation 0
Business acquisitions 1,720,767,000
Foreign currency translation adjustment 553,639,000
Ending balance 11,744,782,000
Western and Southern Europe  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 1,635,707,000
Goodwill reallocation 0
Business acquisitions 217,519,000
Foreign currency translation adjustment 143,498,000
Ending balance 1,996,724,000
U.S. Commercial and State Government  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 1,298,257,000
Goodwill reallocation 0
Business acquisitions 237,886,000
Foreign currency translation adjustment 35,124,000
Ending balance 1,571,267,000
U.S. Federal  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 1,484,296,000
Goodwill reallocation 0
Business acquisitions 47,507,000
Foreign currency translation adjustment 46,908,000
Ending balance 1,578,711,000
Canada  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 1,142,148,000
Goodwill reallocation 0
Business acquisitions 28,750,000
Foreign currency translation adjustment 0
Ending balance 1,170,898,000
Scandinavia, Northwest and Central- East Europe  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 2,021,014,000
Goodwill reallocation (733,992,000)
Business acquisitions 0
Foreign currency translation adjustment 125,423,000
Ending balance 1,412,445,000
U.K. and Australia  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 980,940,000
Goodwill reallocation 0
Business acquisitions 1,143,403,000
Foreign currency translation adjustment 81,110,000
Ending balance 2,205,453,000
Germany  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 0
Goodwill reallocation 733,992,000
Business acquisitions 45,702,000
Foreign currency translation adjustment 68,568,000
Ending balance 848,262,000
Finland, Poland and Baltics  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 637,177,000
Goodwill reallocation 0
Business acquisitions 0
Foreign currency translation adjustment 54,312,000
Ending balance 691,489,000
Asia Pacific  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 270,837,000
Goodwill reallocation 0
Business acquisitions 0
Foreign currency translation adjustment (1,304,000)
Ending balance 269,533,000
Scandinavia and Central Europe  
Reconciliation of changes in goodwill [abstract]  
Beginning balance 1,462,970
Northwest And Central-East Europe  
Reconciliation of changes in goodwill [abstract]  
Beginning balance $ 558,044