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v3.25.3

Goodwill - Narrative (Details) | 12 Months Ended
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Sep. 30, 2025 segment
Intangible assets and goodwill [abstract] |
Number of operating segments | 9

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- Definition Number Of Operating Segments 1 + References No definition available. + Details
Name: | gib_NumberOfOperatingSegments1
Namespace Prefix: | gib_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_IntangibleAssetsAndGoodwillAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration