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Segmented information - Narrative (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Disclosure of major customers [line items] |  |
Revenue | $ 12,867,201 | $ 12,126,793
U.S. Federal |  |
Disclosure of major customers [line items] |  |
Revenue | 1,750,902 | 1,607,431
U.S. Federal | Government |  |
Disclosure of major customers [line items] |  |
Revenue | $ 1,705,173 | $ 1,550,345
Percentage of revenues | 13.30% | 12.80%

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