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v3.25.3

Commitments, contingencies and guarantees - Commitments (Details) | Sep. 30, 2025 CAD ($)
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Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] |
Minimum payments due under long-term service and other agreements | $ 464,023,000

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- Definition Commitments For Long-Term Service And Other Agreements + References No definition available. + Details
Name: | gib_CommitmentsForLongTermServiceAndOtherAgreements
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] + References No definition available. + Details
Name: | gib_OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
Namespace Prefix: | gib_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration