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Long-term debt (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2024
Borrowings [abstract] |
Disclosure of long-term debt |
| As at September 30, 2024 | As at September 30, 2023
| $ | $
2014 U.S. Senior Notes of $473,025 (U.S. $350,000)1 | — |  | 473,808 |
2021 U.S. Senior Notes of $810,900 (U.S. $600,000) repayable in September 2026 and of $540,600 (U.S. $400,000) repayable in September 2031 2 | 1,342,758 |  | 1,342,714 |
2021 CAD Senior Notes of $600,000 repayable in September 2028 3 | 597,212 |  | 596,550 |
2024 CAD Senior Notes of $300,000 repayable in September 2027 and of $450,000 repayable in September 2029 4 | 746,144 |  | — |
Unsecured committed term loan credit facility 5 | — |  | 676,886 |
Other long-term debt | 2,194 |  | 10,363 |
| 2,688,308 |  | 3,100,321 |
Current portion | 999 |  | 1,158,971 |
| 2,687,309 |  | 1,941,350 |
1 In September 2024, the Company repaid the last two series of the senior unsecured notes issued in 2014 of U.S.$350,000,000 (2014 U.S. Senior Notes), for a total amount of $475,825,000, and settled the related cross-currency swaps (Note 32). 2 The senior unsecured notes issued in 2021 of U.S. $1,000,000,000 (2021 U.S. Senior Notes) are comprised of two series of senior unsecured notes with a weighted average maturity of 4 years and a weighted average interest rate of 1.79%. As at September 30, 2024, these represent an amount of $1,351,500,000, less financing fees. 3 As at September 30, 2024, an amount of $600,000,000 was borrowed, less financing fees. The senior unsecured notes issued in 2021 of $600,000,000 (2021 CAD Senior Notes) are due in September 2028, with an interest rate of 2.10%. 4 In September 2024, the Company issued senior unsecured notes (2024 CAD Senior Notes) for a total principal amount of $750,000,000, less financing fees. This issuance is comprised of two series of senior unsecured notes with a weighted average maturity of 4 years and a weighted average interest rate of 4.08%. 5 In December 2023, the Company repaid in full its unsecured committed term loan credit facility of U.S. $500,000,000, for a total amount of $670,350,000. The Company also settled the related cross-currency swaps (Note 32).

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