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Financial instruments - Narrative (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | $ 3,267,034 | $ 3,401,656
Settlement of derivative financial instruments | 6,258 | (6,992)
Cash and cash equivalents, funds held for clients, short-term investments and long-term investments | 1,588,307 | 2,312,741
Available credit facility | 1,495,730 | 1,493,372
Trade receivables | 1,106,187 | $ 938,417
Settled cross-currency swap agreement |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount | $ 69,300 |
Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent | 1.00% |
Currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent | 10.00% |
Senior U.S. Unsecured Notes [Member] | Currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | $ 1,547,617 |
Hedges of net investments in European operations | Cross-currency swaps in Euro |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount | 600,000 |
Hedges of net investments in European operations | Currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount | 1,547,680 |
At fair value | Settled cross-currency swap agreement |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Settlement of derivative financial instruments | $ 6,258 |

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