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Commitments, contingencies and guarantees - Commitments (Details) $ in Thousands	Sep. 30, 2022 CAD ($)
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]
Minimum payments due under long-term service and other agreements	$ 250,049

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- Definition

Commitments For Long-Term Service And Other Agreements

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No definition available.

+ Details

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Namespace Prefix:	gib_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]

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No definition available.

+ Details

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Namespace Prefix:	gib_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration