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Financial instruments - Cross-currency swap agreements (Details) € in Thousands, £ in Thousands, kr in Thousands, $ in Thousands, $ in Thousands | Sep. 30, 2023 CAD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2023 GBP (£) | Sep. 30, 2023 SEK (kr) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 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 |  |  |  |  | $ 24,060
Cross-currency swaps | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, assets | 97,574 |  |  |  |  | 229,301
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 |  |  |  |  | 78,647
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 | 690,100 |  |  |  |  |
Pay Notional | € |  | € 476,737 |  |  |  |
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 | 11,972 |  |  |  |  | 24,247
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 |  |  |  |  | 12,625
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 | 58,419 |  |  |  |  |
Pay Notional | kr |  |  |  | kr 371,900 |  |
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 | $ 44,386 |  |  |  |  | 104,330
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 |
Receive Rate | 1.10% | 1.10% | 1.10% | 1.10% | 1.10% |
Pay Notional | € |  | € 443,381 |  |  |  |
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 | $ 6,163 |  |  |  |  | $ 9,452
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] |  |  |  |  |  |
Receive Rate | 3.57% | 3.57% | 3.57% | 3.57% | 3.57% |
Pay rate | 2.12% | 2.12% | 2.12% | 2.12% | 2.12% |
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 | 3.81% | 3.81% | 3.81% | 3.81% | 3.81% |
Pay rate | 2.51% | 2.51% | 2.51% | 2.51% | 2.51% |
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] |  |  |  |  |  |
Receive Rate | 3.68% | 3.68% | 3.68% | 3.68% | 3.68% |
Pay rate | 2.18% | 2.18% | 2.18% | 2.18% | 2.18% |
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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