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Remaining performance obligations (Details) - CAD ($)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Disclosure of performance obligations [abstract]
Transaction price allocated to remaining performance obligations	$ 1,179,804,000	$ 982,531,000
Remaining performance obligations, weighted average average period	1 year 8 months 12 days	2 years

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- Definition

Remaining Performance Obligations, Weighted Average Period

+ 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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- References

No definition available.

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

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- Definition

The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 120
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_120_a&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant