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Related Party Disclosures - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2021
Apr. 30, 2022
Disclosure of transactions between related parties [line items]      
Purchase of treasury shares $ 318,882    
Borrowings 50,803    
Nonderivative Financial Liabilities Carrying Amount $ 123,780   $ 4,304
Borrowings maturity 2 years    
AMTD IDEA Group [Member]      
Disclosure of transactions between related parties [line items]      
Borrowings interest rate 2.00%    
Noninterest Bearing Amount Due To A Noncontrolling Shareholder [Member]      
Disclosure of transactions between related parties [line items]      
Borrowings $ 20,681    
Nonderivative Financial Liabilities Carrying Amount 20,681    
Interest Bearing Amount Due To A Non Controlling Shareholder [Member]      
Disclosure of transactions between related parties [line items]      
Nonderivative Financial Liabilities Carrying Amount $ 33,122    
Borrowings maturity repayable within one year and the remaining balances of which are repayable on demand as at April 30, 2023.    
Hong Kong Interbank Offered Rate [Member]      
Disclosure of transactions between related parties [line items]      
Borrowings $ 25,479    
Borrowings Description Of Variable Interest Rate variable rate of HIBOR plus 1.15% per annum    
Borrowings, adjustment to interest rate basis 1.15%    
Hong Kong Interbank Offered Rate [Member] | Interest Bearing Amount Due To A Non Controlling Shareholder [Member]      
Disclosure of transactions between related parties [line items]      
Borrowings $ 7,643    
Borrowings Description Of Variable Interest Rate variable rate of 2 times of HIBOR plus 1.15% per annum    
Borrowings, adjustment to interest rate basis 1.15%    
Common Class B [Member]      
Disclosure of transactions between related parties [line items]      
Number of Treasury Shares Purchased 616,346    
Purchase of treasury shares $ 318,882    
AMTD Group [Member]      
Disclosure of transactions between related parties [line items]      
Amount receivable from related party set off $ 81,972 $ 73,616  
Amount payable to related party set off   45,469  
Fellow Subsidiaries [Member]      
Disclosure of transactions between related parties [line items]      
Amount receivable from related party set off   212,394  
Amount payable to related party set off   $ 239,206