XML 114 R72.htm IDEA: XBRL DOCUMENT
v3.23.3

Summary of material accounting policies - Disclosure of estimated useful lives of intangible assets (Details) | 12 Months Ended
--- | ---
Sep. 30, 2023
Minimum | Software internally developed |
Disclosure of detailed information about intangible assets [line items] |
Estimated useful life | 1 year
Minimum | Business solutions |
Disclosure of detailed information about intangible assets [line items] |
Estimated useful life | 3 years
Minimum | Client relationships |
Disclosure of detailed information about intangible assets [line items] |
Estimated useful life | 5 years
Maximum | Software internally developed |
Disclosure of detailed information about intangible assets [line items] |
Estimated useful life | 8 years
Maximum | Business solutions |
Disclosure of detailed information about intangible assets [line items] |
Estimated useful life | 10 years
Maximum | Client relationships |
Disclosure of detailed information about intangible assets [line items] |
Estimated useful life | 7 years

X
- 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_DisclosureOfIntangibleAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2023-01-01 -Paragraph 118 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_118_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=gib_ComputerSoftwareInternalUseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=gib_ComputerSoftwareBusinessSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_CustomerrelatedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |