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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2023
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, 2022 1,440,019  1,278,176  1,142,148  1,108,267  1,345,346  834,960  567,628  501,307  263,605  8,481,456 
Business acquisitions (Note 27)
 21,001  —  —  —  —  (67) —  —  —  20,934 
Foreign currency translation adjustment 94,710  (19,799) —  (17,564) 37,970  61,916  37,257  30,822  (3,252) 222,060 
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 
Key assumptions for cash-generating units
The key assumptions for the CGUs are disclosed in the following tables for the years ended September 30:
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 
2022 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
 10.0  10.6  10.7  9.2  10.5  10.6  10.7  10.7  19.2 
Long-term growth rate of net operating cash flows1
 1.8  2.0  2.0  2.0  2.0  1.9  2.0  1.9  2.0 
1 The long-term growth rate is based on the lower of published industry research growth and 2.0%.