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Related party transactions (Tables) | 12 Months Ended
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Sep. 30, 2025
Related party transactions [abstract] |
Disclosure of transactions with subsidiaries | The Company’s principal subsidiaries whose revenues, based on the geographic delivery model, represent more than 3% of the consolidated revenues are as follows:
Name of subsidiary | Country of incorporation
CGI Technologies and Solutions Inc. | United States
CGI France SAS | France
CGI Federal Inc. | United States
CGI IT UK Limited | United Kingdom
CGI Information Systems and Management Consultants Inc. | Canada
Conseillers en gestion et informatique CGI inc. | Canada
CGI Deutschland B.V. & Co. KG | Germany
CGI Information Systems and Management Consultants Private Limited | India
CGI Sverige AB | Sweden
CGI Suomi Oy | Finland
CGI Nederland B.V. | Netherlands
Disclosure of compensation of key management personnel | Compensation of key management personnel, currently defined as the executive officers and the Board of Directors of the Company, was as follows for the year ended September 30:
| 2025 | 2024
| $ | $
Short-term employee benefits | 30,043 |  | 31,076 |
Share-based payments | 37,002 |  | 40,209 |

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- Definition The disclosure of interests in subsidiaries. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph 2 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_2_b_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The disclosure of transactions between the entity and its related parties. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2025-01-01 -Paragraph 18 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2025-en-r&anchor=para_18&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 230 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_230&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 230 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_230&doctype=Standard -URIDate 2025-03-27 + Details
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