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Summary of material accounting policies - Narrative (Details) - CAD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Disclosure of voluntary change in accounting policy [line items]
Funds held for clients	$ 506,780	$ 488,727
Cash and cash equivalents
Disclosure of voluntary change in accounting policy [line items]
Funds held for clients	$ 233,584	$ 269,792

X

- Definition

The amount in the consolidated financial statements of the assets of the group to which significant restrictions (for example, statutory, contractual and regulatory restrictions) apply on the entity's ability to access or use the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph 13
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_13_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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

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

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

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=gib_CashAndCashEquivalents1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: