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Accumulated other comprehensive income | 12 Months Ended
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Sep. 30, 2025
Disclosure of analysis of other comprehensive income by item [abstract] |
Accumulated other comprehensive income | Accumulated other comprehensive income
| As at September 30, 2025 | As at September 30, 2024
| $ | $
Items that will be reclassified subsequently to net earnings: |  |
Net unrealized gains on translating financial statements of foreign operations, net of accumulated income tax expense of $59,141 ($44,210 as at September 30, 2024) | 1,588,980 |  | 896,259 |
Net losses on cross-currency swaps and on translating long-term debt designated as hedges of net investments in foreign operations, net of accumulated income tax recovery of $46,173 ($48,921 as at September 30, 2024) | (542,309) |  | (388,957) |
Deferred gains of hedging on cross-currency swaps, net of accumulated income tax expense of $2,538 ($2,907 as at September 30, 2024) | 17,130 |  | 19,031 |
Net unrealized losses on cash flow hedges, net of accumulated income tax recovery of $10,042 ($1,421 as at September 30, 2024) | (34,359) |  | (6,930) |
Net unrealized gains on financial assets at fair value through other comprehensive income, net of accumulated income tax expense of $1,361 ($707 as at September 30, 2024) | 4,328 |  | 2,447 |
Items that will not be reclassified subsequently to net earnings: |  |
Net remeasurement losses on defined benefit plans, net of accumulated income tax recovery of $11,755 ($24,817 as at September 30, 2024) | (31,426) |  | (70,597) |
| 1,002,344 |  | 451,253 |
For the year ended September 30, 2025, $4,594,000 of the net unrealized gains on cash flow hedges, net of income tax expense of $1,627,000, previously recognized in other comprehensive income were reclassified in the consolidated statements of earnings ($10,872,000, net of income tax expense of $3,814,000, were reclassified for the year ended September 30, 2024). For the year ended September 30, 2025, $12,169,000 of the deferred gains of hedging on cross-currency swaps, net of income tax expense of $1,859,000, were also reclassified in the consolidated statements of earnings ($12,562,000, net of income tax expense of $1,919,000, were reclassified for the year ended September 30, 2024).

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