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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2024
Intangible assets and goodwill [abstract]  
Disclosure of movements in goodwill
The movements in goodwill were as follows:
Western and Southern Europe U.S. Commercial and State Government Canada U.S. Federal Scandinavia and Central Europe U.K. and Australia Finland, Poland and Baltics Northwest and Central-East Europe Asia Pacific Total
$ $ $ $ $ $ $ $ $ $
As at September 30, 2023 1,555,730  1,258,377  1,142,148  1,090,703  1,383,316  896,809  604,885  532,129  260,353  8,724,450 
Business acquisitions (Note 27)
 —  42,055  —  397,406  —  —  —  —  —  439,461 
Foreign currency translation adjustment 79,977  (2,175) —  (3,813) 79,654  84,131  32,292  25,915  10,484  306,465 
As at September 30, 2024 1,635,707  1,298,257  1,142,148  1,484,296  1,462,970  980,940  637,177  558,044  270,837  9,470,376 
Key assumptions for cash-generating units
The key assumptions for the CGUs are disclosed in the following tables for the years ended September 30:
2024 Western and Southern Europe U.S. Commercial and State Government Canada U.S. Federal Scandinavia and Central Europe U.K. and Australia Finland, Poland and Baltics Northwest and Central-East Europe Asia Pacific
% % % % % % % % %
Pre-tax WACC
 10.3  11.4  10.9  10.3  10.0  11.5  10.3  10.2  17.8 
Long-term growth rate of net operating cash flows1
 2.0  2.0  2.0  2.0  2.0  2.0  2.0  2.0  2.0 
2023 Western and Southern Europe U.S. Commercial and State Government Canada U.S. Federal Scandinavia and Central Europe U.K. and Australia Finland, Poland and Baltics Northwest and Central-East Europe Asia Pacific
% % % % % % % % %
Pre-tax WACC
 11.7  11.9  11.0  10.3  12.1  13.7  12.2  12.1  20.3 
Long-term growth rate of net operating cash flows1
 2.0  2.0  2.0  2.0  2.0  2.0  2.0  2.0  2.0 
1 The long-term growth rate is based on the lower of published industry research growth and 2.0%.