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Capital risk management (Details) - CAD ($)	Sep. 30, 2024	Sep. 30, 2023
Capital Risk Management [Abstract]
Total managed capital	$ 14,225,026,000	$ 13,645,314,000

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- Definition

Capital Risk Management

+ References

No definition available.

+ Details

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- Definition

Managed Capital

+ References

No definition available.

+ Details

Name:	gib_ManagedCapital
Namespace Prefix:	gib_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant