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Reconciliation of Liabilities Arising from Financing Activities - Summary of Changes in Liabilities Arising from Financing Activities (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2021
AMTD Group [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Amount receivable from related party set off | $ 81,972 | $ 73,616
Due to AMTD Group [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Due to related party |  | 45,469
Due to Fellow Subsidiaries [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Due to related party |  | $ 239,206

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