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Accumulated other comprehensive income (Details) - CAD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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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 $44,210 ($44,867 as at September 30, 2023) | $ 896,259 | $ 534,321
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 $48,921 ($49,991 as at September 30, 2023) | (388,957) | (325,649)
Deferred gains of hedging on cross-currency swaps, net of accumulated income tax expense of $2,907 ($1,754 as at September 30, 2023) | 19,031 | 13,541
Net unrealized (losses) gains on cash flow hedges, net of accumulated income tax recovery of $1,421 (net of accumulated income tax expense of $3,953 as at September 30, 2023) | (6,930) | 11,524
Net unrealized gains (losses) on financial assets at fair value through other comprehensive income, net of accumulated income tax expense of $707 (net of accumulated income tax recovery of $1,189 as at September 30, 2023) | 2,447 | (3,412)
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) | 44,210 | 44,867
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 | 48,921 | 49,991
Deferred gains of hedging on cross-currency swaps, accumulated income tax expense (recovery) | 2,907 | 1,754
Net unrealized gains on cash flow hedges, accumulated income tax expense (recovery) | 1,421 | 3,953
Net unrealized (losses) gains on financial assets at fair value through other comprehensive income, accumulated income tax (recovery) expense | 707 | (1,189)
Items that will not be reclassified subsequently to net earnings: |  |
Net remeasurement losses on defined benefit plans, net of accumulated income tax recovery of $24,817 ($25,173 as at September 30, 2023) | (70,597) | (71,350)
Items that will not be reclassified subsequently to net earnings, tax portion: |  |
Net remeasurement losses on defined benefit plans, accumulated income tax recovery | 24,817 | 25,173
Accumulated other comprehensive income | $ 451,253 | $ 158,975

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