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Financial instruments - Cross-currency swap agreements (Details) € in Thousands, £ in Thousands, kr in Thousands, $ in Thousands, $ in Thousands | Sep. 30, 2024 CAD ($) | Sep. 30, 2024 EUR (€) | Sep. 30, 2024 GBP (£) | Sep. 30, 2024 SEK (kr) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 CAD ($)
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At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | $ 14,350
Cross-currency swaps | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 97,574
Hedging instrument, liabilities | $ (9,500) |  |  |  |  |
Hedges of net investments in European operations | Cross-currency swaps in Euro | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 22,966
Hedging instrument, liabilities | (7,806) |  |  |  |  |
Hedges of net investments in European operations | Cross-currency swaps in Euro | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Notional | 1,270,000 |  |  |  |  |
Pay Notional | € |  | € 866,365 |  |  |  |
Hedges of net investments in European operations | Cross-currency swaps in British pound | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, assets | 0 |  |  |  |  | 11,972
Hedges of net investments in European operations | Cross-currency swaps in British pound | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Notional | 136,274 |  |  |  |  |
Pay Notional | £ |  |  | £ 75,842 |  |  |
Hedges of net investments in European operations | Cross-currency swaps in Swedish krona | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 12,087
Hedging instrument, liabilities | (1,694) |  |  |  |  |
Hedges of net investments in European operations | Cross-currency swaps in Swedish krona | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Notional | $ 80,000 |  |  |  |  |
Receive Rate | 4.15% | 4.15% | 4.15% | 4.15% | 4.15% |
Pay Notional | kr |  |  |  | kr 609,940 |  |
Hedges of net investments in European operations and cash flow hedges on unsecured committed term loan credit facility | Cross-currency swap agreement between USD to Euro | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, assets | $ 0 |  |  |  |  | 44,386
Hedges of net investments in European operations and cash flow hedges on unsecured committed term loan credit facility | Cross-currency swap agreement between USD to Euro | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Notional |  |  |  |  | $ 500,000 |
Pay Notional | € |  | € 443,381 |  |  |  |
Hedges of net investments in European operations and cash flow hedges on unsecured committed term loan credit facility | Cross-currency swap agreement between USD to Euro | Currency risk | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 1.10% | 1.10% | 1.10% | 1.10% | 1.10% |
Cash flow hedges of 2014 U.S. Senior Notes | Cross-currency swap agreement between USD to CAD | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, assets | $ 0 |  |  |  |  | $ 6,163
Cash flow hedges of 2014 U.S. Senior Notes | Cross-currency swap agreement between USD to CAD | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Notional |  |  |  |  | $ 215,000 |
Pay Notional | $ 284,793 |  |  |  |  |
Minimum | Hedges of net investments in European operations | Cross-currency swaps in Euro | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 1.62% | 1.62% | 1.62% | 1.62% | 1.62% |
Pay rate | (0.14%) | (0.14%) | (0.14%) | (0.14%) | (0.14%) |
Minimum | Hedges of net investments in European operations | Cross-currency swaps in British pound | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 3.57% | 3.57% | 3.57% | 3.57% | 3.57% |
Pay rate | 2.67% | 2.67% | 2.67% | 2.67% | 2.67% |
Minimum | Hedges of net investments in European operations | Cross-currency swaps in Swedish krona | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Pay rate | 3.49% | 3.49% | 3.49% | 3.49% | 3.49% |
Minimum | Hedges of net investments in European operations and cash flow hedges on unsecured committed term loan credit facility | Cross-currency swap agreement between USD to Euro | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Pay rate | 1.14% | 1.14% | 1.14% | 1.14% | 1.14% |
Minimum | Cash flow hedges of 2014 U.S. Senior Notes | Cross-currency swap agreement between USD to CAD | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 3.74% | 3.74% | 3.74% | 3.74% | 3.74% |
Pay rate | 3.49% | 3.49% | 3.49% | 3.49% | 3.49% |
Maximum | Hedges of net investments in European operations | Cross-currency swaps in Euro | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 4.15% | 4.15% | 4.15% | 4.15% | 4.15% |
Pay rate | 3.70% | 3.70% | 3.70% | 3.70% | 3.70% |
Maximum | Hedges of net investments in European operations | Cross-currency swaps in British pound | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 3.63% | 3.63% | 3.63% | 3.63% | 3.63% |
Pay rate | 2.80% | 2.80% | 2.80% | 2.80% | 2.80% |
Maximum | Hedges of net investments in European operations | Cross-currency swaps in Swedish krona | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Pay rate | 3.51% | 3.51% | 3.51% | 3.51% | 3.51% |
Maximum | Hedges of net investments in European operations and cash flow hedges on unsecured committed term loan credit facility | Cross-currency swap agreement between USD to Euro | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Pay rate | 1.22% | 1.22% | 1.22% | 1.22% | 1.22% |
Maximum | Cash flow hedges of 2014 U.S. Senior Notes | Cross-currency swap agreement between USD to CAD | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 4.06% | 4.06% | 4.06% | 4.06% | 4.06% |
Pay rate | 3.81% | 3.81% | 3.81% | 3.81% | 3.81% |

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