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Accumulated other comprehensive income (Details) - CAD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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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 $44,867 ($45,419 as at September 30, 2022) | $ 534,321 | $ 291,532
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 $49,991 ($43,936 as at September 30, 2022) | (325,649) | (271,690)
Deferred gains of hedging on cross-currency swaps, net of accumulated income tax expense of $1,754 ($4,664 as at September 30, 2022) | 13,541 | 28,274
Net unrealized gains on cash flow hedges, net of accumulated income tax expense of $3,953 ($10,398 as at September 30, 2022) | 11,524 | 30,274
Net unrealized losses on financial assets at fair value through other comprehensive income, net of accumulated income tax recovery of $1,189 (net of accumulated income tax expense of $1,367 as at September 30, 2022) | (3,412) | (4,072)
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) | 44,867 | 45,419
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 | 49,991 | 43,936
Deferred gains of hedging on cross-currency swaps, accumulated income tax expense (recovery) | 1,754 | 4,664
Net unrealized gains on cash flow hedges, accumulated income tax expense (recovery) | 3,953 | 10,398
Net unrealized (losses) gains on financial assets at fair value through other comprehensive income, accumulated income tax (recovery) expense | (1,189) | 1,367
Items that will not be reclassified subsequently to net earnings: |  |
Net remeasurement losses on defined benefit plans, net of accumulated income tax recovery of $25,173 ($12,095 as at September 30, 2022) | (71,350) | (34,572)
Items that will not be reclassified subsequently to net earnings, tax portion: |  |
Net remeasurement losses on defined benefit plans, accumulated income tax recovery | 25,173 | 12,095
Accumulated other comprehensive income | $ 158,975 | $ 39,746

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