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Capital risk management (Details) - CAD ($) | Sep. 30, 2025 | Sep. 30, 2024
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Capital Risk Management [Abstract] |  |
Total managed capital | $ 15,509,222,000 | $ 14,255,026,000

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- Definition Capital Risk Management + References No definition available. + Details
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Namespace Prefix: | gib_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Managed Capital + References No definition available. + Details
Name: | gib_ManagedCapital
Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant