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Segmented information - Disclosure of revenue information based on services provided by the Company (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Disclosure of products and services [line items] |  |
Revenue | $ 12,867,201 | $ 12,126,793
Managed IT and business process services |  |
Disclosure of products and services [line items] |  |
Revenue | 6,980,988 | 6,722,967
Business and strategic IT consulting and systems integration services |  |
Disclosure of products and services [line items] |  |
Revenue | $ 5,886,213 | $ 5,403,826

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