XML 148 R106.htm IDEA: XBRL DOCUMENT
v3.23.3

Share-based payments - Performance share units (Details) - PSUs | 12 Months Ended
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Sep. 30, 2023 plan shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Number of plans in share-based payment arrangement | plan | 2
Vesting period for PSUs | 4 years
Class A subordinate voting shares |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Number of shares per PSU to which participants are entitled (in shares) | shares | 1

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- Definition Number Of Share-Based Payment Arrangement Plans + References No definition available. + Details
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Namespace Prefix: | gib_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Shares To Be Received For Each Instrument Granted In Share-Based Payment Arrangement + References No definition available. + Details
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Namespace Prefix: | gib_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Period 2 + References No definition available. + Details
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Namespace Prefix: | gib_
Data Type: | xbrli:durationItemType
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
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=gib_ClassASubordinateVotingSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |