XML 150 R108.htm IDEA: XBRL DOCUMENT v3.23.3

Share-based payments - Stock options (Details) - $ / shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Disclosure of classes of share capital [line items]
Weighted average share price for share options at date of exercise (in CAD per share)	$ 123.25	$ 107.09
Stock options
Disclosure of classes of share capital [line items]
Vesting period for stock options	4 years
Expiration period for stock options	10 years
Stock options | Class A subordinate voting shares
Disclosure of classes of share capital [line items]
Number of shares reserved for issuance under the stock option plan (in shares)	15,353,015

X

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Period 2

+ References

No definition available.

+ Details

Name:	gib_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod2
Namespace Prefix:	gib_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Expiration Period 1

+ References

No definition available.

+ Details

Name:	gib_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod1
Namespace Prefix:	gib_
Data Type:	xbrli:durationItemType
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_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of shares reserved for issue under options and contracts for the sale of shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 79
-Subparagraph a
-Clause vii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_vii&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The weighted average share price at the date of exercise for share options that are exercised in a share-based payment arrangement. [Refer: Share-based payment arrangements [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2023-01-01
-Paragraph 45
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_c&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise2019
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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