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Accumulated other comprehensive income (Tables) | 12 Months Ended
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Sep. 30, 2025
Disclosure of analysis of other comprehensive income by item [abstract] |
Schedule of 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 |

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- Definition The entire disclosure of the analysis of other comprehensive income by item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 106A -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106A&doctype=Standard -URIDate 2025-03-27 + Details
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