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Description of business | 12 Months Ended
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Sep. 30, 2025
Corporate information and statement of IFRS compliance [abstract] |
Description of business | Description of business CGI Inc. (the Company), directly or through its subsidiaries, provides managed information technology (IT) and business process services, business and strategic IT consulting and systems integration services, and intellectual property (IP) business solutions to help clients effectively realize their strategies and create added value. The Company was incorporated under Part IA of the Companies Act (Québec), predecessor to the Business Corporations Act (Québec) which came into force on February 14, 2011 and its Class A subordinate voting shares are publicly traded. The executive and registered office of the Company is situated at 1350 René-Lévesque Blvd. West, Montréal, Québec, Canada, H3G 1T4.

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- Definition The entire disclosure for general information about financial statements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 128 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_128&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 51 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_51&doctype=Standard -URIDate 2025-03-27 + Details
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