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Long-term debt (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2022
Borrowings [abstract] |
Disclosure of long-term debt |
| As at September 30, 2022 | As at September 30, 2021
| $ | $
2011 U.S. Senior unsecured note of $319,663 (U.S.$250,000)1 | — |  | 318,009 |
2014 U.S. Senior unsecured notes repayable in September by tranches of $412,680 (U.S.$300,000) in 2024 and $137,560 (U.S.$100,000) in two yearly repayments of U.S.$50,000 in 2023 and 2024 2 | 550,177 |  | 570,298 |
2021 U.S. Senior unsecured notes repayable of $825,360 (U.S.$600,000) in September 2026 and $550,240 (U.S.$400,000) in September 2031 3 | 1,361,974 |  | 1,253,226 |
2021 CAD Senior unsecured notes repayable of $600,000 in September 2028 4 | 595,900 |  | 595,331 |
Unsecured committed term loan credit facility 5 | 687,705 |  | 633,623 |
Other long-term debt | 71,278 |  | 31,169 |
| 3,267,034 |  | 3,401,656 |
Current portion | 93,447 |  | 392,727 |
| 3,173,587 |  | 3,008,929 |
1 In December 2021, the Company repaid the last tranche of the Senior U.S. unsecured note issued in 2011 of U.S. $250,000,000 (2011 U.S. Senior Note), for a total amount of $319,663,000, and settled the related interest rate swaps (Note 31). 2 As at September 30, 2022, an amount of $550,240,000 was borrowed, less financing fees. The private placement is comprised of two tranches of Senior U.S. unsecured notes with a weighted average maturity of 1.8 years and a weighted average interest rate of 3.98% (3.95% in 2021) (2014 U.S. Senior Notes). In September 2022, the Company repaid the fifth of the seven yearly scheduled repayments of U.S.$50,000,000 on a tranche of the Senior U.S. unsecured notes for a total amount of $64,880,000 and settled the related cross-currency swaps (Note 31). The Senior unsecured notes contain covenants that require the Company to maintain certain financial ratios (Note 32). As at September 30, 2022, the Company was in compliance with these covenants. 3 As at September 30, 2022, an amount of $1,375,600,000 was borrowed less financing fees. The 2021 U.S. Senior Notes are comprised of two series of Senior U.S. unsecured notes with a weighted average maturity of 6 years and a weighted average interest rate of 1.79%. During the year ended September 30, 2022, the Company completed an offer to exchange all of its outstanding U.S.$1,000,000,000 in aggregate principal amount of senior unsecured notes, originally issued in September 2021 for an equivalent amount of notes registered with the U.S. Securities and Exchange Commission (2021 U.S. Senior Notes). 4 As at September 30, 2022, an amount of $600,000,000 was borrowed, less financing fees. The 2021 CAD Senior Notes are due in September 2028, with an interest rate of 2.10%. 5 As at September 30, 2022, an amount of $687,800,000 was borrowed, less financing fees. This facility bears interest based on the 1 month USD LIBOR rate, plus a variable margin that is determined based on the Company's leverage ratio. The unsecured committed term loan credit facility is due in December 2023, with a weighted average interest rate of 4.00%. The unsecured committed term loan credit facility contains covenants that require the Company to maintain certain financial ratios (Note 32). As at September 30, 2022, the Company was in compliance with these covenants.

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