XML 151 R112.htm IDEA: XBRL DOCUMENT
v3.25.3

Share-based payments - Share purchase plan (Details) | 12 Months Ended
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Sep. 30, 2025
Share purchase plan |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Maximum match of employee's basic contribution (as a percent) | 3.50%

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- Definition Share-Based Payment Arrangement, Employer Matching Contribution, Percent Of Match + References No definition available. + Details
Name: | gib_ShareBasedPaymentArrangementEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | gib_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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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
Name: | ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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