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Goodwill (Tables) | 12 Months Ended
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Sep. 30, 2025
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 | U.S. Federal | Canada | Scandinavia, Northwest and Central- East Europe 1 | U.K. and Australia | Germany | Finland, Poland and Baltics | Asia Pacific | Total
| $ | $ | $ | $ | $ | $ | $ | $ | $ | $
As at September 30, 2024 | 1,635,707 |  | 1,298,257 |  | 1,484,296 |  | 1,142,148 |  | 2,021,014 |  | 980,940 |  | — |  | 637,177 |  | 270,837 |  | 9,470,376 |
Goodwill reallocation | — |  | — |  | — |  | — |  | (733,992) |  | — |  | 733,992 |  | — |  | — |  | — |
Business acquisitions (Note 27) | 217,519 |  | 237,886 |  | 47,507 |  | 28,750 |  | — |  | 1,143,403 |  | 45,702 |  | — |  | — |  | 1,720,767 |
Foreign currency translation adjustment | 143,498 |  | 35,124 |  | 46,908 |  | — |  | 125,423 |  | 81,110 |  | 68,568 |  | 54,312 |  | (1,304) |  | 553,639 |
As at September 30, 2025 | 1,996,724 |  | 1,571,267 |  | 1,578,711 |  | 1,170,898 |  | 1,412,445 |  | 2,205,453 |  | 848,262 |  | 691,489 |  | 269,533 |  | 11,744,782 |
1 As at September 30, 2024, the goodwill of Scandinavia and Central Europe of $1,462,970 and Northwest and Central-East Europe of $558,044, under the old management structure, were combined for presentation purposes.
Key assumptions for cash-generating units | The key assumptions for the CGUs are disclosed in the following tables for the years ended September 30:
2025 | Western and Southern Europe | U.S. Commercial and State Government | U.S. Federal | Canada | Scandinavia, Northwest and Central- East Europe | U.K. and Australia | Germany | Finland, Poland and Baltics | Asia Pacific
| % | % | % | % | % | % | % | % | %
Pre-tax WACC | 9.7 |  | 11.3 |  | 11.4 |  | 9.1 |  | 8.5 |  | 11.1 |  | 10.1 |  | 9.9 |  | 15.9 |
Long-term growth rate of net operating cash flows 1 | 2.0 |  | 2.0 |  | 2.0 |  | 2.0 |  | 2.0 |  | 2.0 |  | 1.9 |  | 2.0 |  | 2.0 |
2024 | Western and Southern Europe | U.S. Commercial and State Government | U.S. Federal | Canada | Scandinavia and Central Europe | U.K. and Australia | Northwest and Central-East Europe | Finland, Poland and Baltics | Asia Pacific
| % | % | % | % | % | % | % | % | %
Pre-tax WACC | 10.3 |  | 11.4 |  | 10.3 |  | 10.9 |  | 10.0 |  | 11.5 |  | 10.2 |  | 10.3 |  | 17.8 |
Long-term growth rate of net operating cash flows 1 | 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%.

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- Definition The disclosure of the reconciliation of changes in intangible assets and goodwill. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2025-01-01 -Paragraph 118 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118&doctype=Standard -URIDate 2025-03-27 + Details
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