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Financial instruments - Narrative (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | $ 2,688,308,000 | $ 3,100,321,000
Cash and cash equivalents, funds held for clients, short-term investments and long-term investments | 1,995,413,000 | 2,081,463,000
Available credit facility | 1,496,355,000 | 1,495,858,000
Trade receivables | 1,117,712,000 | 1,152,880,000
Cross-Currency Swap Agreeement Between Canadian Dollar And Euro [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount of financial liabilities | 670,000,000 |
Cross-currency swaps in Swedish krona |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount of financial liabilities | 80,000,000 |
Settled cross-currency swap agreement |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount of financial liabilities | 954,832,000 |
Net gain on settlement of derivatives | 38,943,000 |
Net gain on settlement of cash flow hedge, profit or loss | 7,811,000 |
Net gain on settlement of net investment hedge. other comprehensive income | 31,132,000 |
Unsecured committed term loan credit facility |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | 0 | 676,886,000
2021 U.S. Senior Notes |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | $ 1,342,758,000 | $ 1,342,714,000
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% |
Currency risk | Hedges of net investments in European operations |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount of financial liabilities | $ 1,351,500,000 |
Currency risk | 2021 U.S. Senior Notes |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | $ 1,342,758,000 |

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