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Accumulated other comprehensive income - Schedule of accumulated other comprehensive income (Details) - CAD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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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 be reclassified subsequently to net earnings, tax portion: |  |
Net unrealized gains on translating financial statements of foreign operations, accumulated income tax expense (recovery) | 59,141 | 44,210
Net losses on cross-currency swaps and on translating long-term debt designated as hedges of net investments in foreign operations, accumulated income tax recovery | 46,173 | 48,921
Deferred gains of hedging on cross-currency swaps, accumulated income tax expense (recovery) | 2,538 | 2,907
Net unrealized gains on cash flow hedges, accumulated income tax expense (recovery) | 10,042 | 1,421
Net unrealized (losses) gains on financial assets at fair value through other comprehensive income, accumulated income tax (recovery) expense | 1,361 | 707
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)
Items that will not be reclassified subsequently to net earnings, tax portion: |  |
Net remeasurement losses on defined benefit plans, accumulated income tax recovery | 11,755 | 24,817
Accumulated other comprehensive income | $ 1,002,344 | $ 451,253

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