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v3.25.3

Share-based payments - Deferred share unit plan (Details) - shares | Sep. 30, 2025 | Sep. 30, 2024
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DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of outstanding DSUs (in shares) | 99,938 | 110,412

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=gib_DeferredShareUnitPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |