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Financial instruments - Cross-currency swap agreements (Details) € in Thousands, kr in Thousands, kr in Thousands, $ in Thousands, $ in Thousands | Sep. 30, 2025 CAD ($) | Sep. 30, 2025 EUR (€) | Sep. 30, 2025 SEK (kr) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 DKK (kr) | Sep. 30, 2024 CAD ($)
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Cross-currency swaps | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, liabilities | $ (137,785) |  |  |  |  | $ (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, liabilities | (109,168) |  |  |  |  | (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 Swedish krona | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, liabilities | (9,090) |  |  |  |  | (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 the 2021 U.S. Senior Notes | Cross-currency swap agreement between USD to Swedish krona | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, liabilities | $ (2,448) |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 0
Hedges of net investments in European operations and cash flow hedges on the 2021 U.S. Senior Notes | Cross-currency swap agreement between USD to Swedish krona | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Notional |  |  |  | $ 63,500 |  |
Pay Notional | kr |  |  | kr 619,583 |  |  |
Hedges of net investments in European operations and cash flow hedges on the 2021 U.S. Senior Notes | Cross-currency swap agreement between USD to Danish krone | At fair value |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Hedging instrument, liabilities | (54) |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | 0
Hedges of net investments in European operations and cash flow hedges on the 2021 U.S. Senior Notes | Cross-currency swap agreement between USD to Danish krone | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Notional |  |  |  | 11,500 |  |
Pay Notional | kr |  |  |  |  | kr 73,986 |
Cash flow hedges on the 2025 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, liabilities | $ (17,025) |  |  |  |  |
Hedging instrument, assets |  |  |  |  |  | $ 0
Cash flow hedges on the 2025 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 |  |  |  | $ 650,000 |  |
Receive Rate | 495.00% | 495.00% | 495.00% | 495.00% | 495.00% |
Pay Notional | $ 933,985 |  |  |  |  |
Pay rate | 371.00% | 371.00% | 371.00% | 371.00% | 371.00% |
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 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 the 2021 U.S. Senior Notes | Cross-currency swap agreement between USD to Swedish krona | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 1.45% | 1.45% | 1.45% | 1.45% | 1.45% |
Pay rate | (0.73%) | (0.73%) | (0.73%) | (0.73%) | (0.73%) |
Minimum | Hedges of net investments in European operations and cash flow hedges on the 2021 U.S. Senior Notes | Cross-currency swap agreement between USD to Danish krone | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 1.45% | 1.45% | 1.45% | 1.45% | 1.45% |
Pay rate | (1.01%) | (1.01%) | (1.01%) | (1.01%) | (1.01%) |
Minimum | Cash flow hedges on the 2025 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 | 3.71% | 3.71% | 3.71% | 3.71% | 3.71% |
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 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 the 2021 U.S. Senior Notes | Cross-currency swap agreement between USD to Swedish krona | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 2.30% | 2.30% | 2.30% | 2.30% | 2.30% |
Pay rate | 1.01% | 1.01% | 1.01% | 1.01% | 1.01% |
Maximum | Hedges of net investments in European operations and cash flow hedges on the 2021 U.S. Senior Notes | Cross-currency swap agreement between USD to Danish krone | Currency risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Receive Rate | 2.30% | 2.30% | 2.30% | 2.30% | 2.30% |
Pay rate | 0.85% | 0.85% | 0.85% | 0.85% | 0.85% |
Maximum | Cash flow hedges on the 2025 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 | 4.95% | 4.95% | 4.95% | 4.95% | 4.95% |

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