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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2022
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, 2021 1,022,350  1,169,772  1,142,148  947,782  1,140,573  895,921  619,990  931,361  269,804  8,139,701 
Business acquisitions (Note 26)
 516,204  9,970  —  73,375  —  31,299  —  —  —  630,848 
Goodwill reallocation (3,236) —  —  —  367,907  —  —  (364,671) —  — 
Foreign currency translation adjustment (95,299) 98,434  —  87,110  (163,134) (92,260) (52,362) (65,383) (6,199) (289,093)
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 
Key assumptions for cash-generating units
The key assumptions for the CGUs are disclosed in the following tables for the years ended September 30:
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 
2021 Western and Southern Europe U.S. Commercial and State Government Canada U.S. Federal Scandinavia U.K. and Australia Finland, Poland and Baltics Central and Eastern Europe Asia Pacific
% % % % % % % % %
Pre-tax WACC
 10.0  8.5  9.1  8.1  9.3  8.8  9.5  9.4  18.5 
Long-term growth rate of net operating cash flows1
 1.6  2.0  2.0  2.0  1.8  1.9  1.7  1.8  2.0 
1 The long-term growth rate is based on the lower of published industry research growth and 2.0%.