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Share-based payments - Share purchase plan (Details)	12 Months Ended
	Sep. 30, 2024
Share purchase plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Maximum match of employee's basic contribution (as a percent)	3.50%

X

- Definition

Share-Based Payment Arrangement, Employer Matching Contribution, Percent Of Match

+ References

No definition available.

+ Details

Name:	gib_ShareBasedPaymentArrangementEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	gib_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

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_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=gib_EmployeeSharePurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: