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Financial Instruments - Summary of Reconciliation of Level 3 fair value measurements (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Disclousre of Detailed Information about Reconciliation of Level3 Fair Value Measurements Explanatory [Line Items]      
Beginning Balance [1] $ 410,505    
Exchange realignment (151)   $ (171)
Ending Balance 661,676 $ 410,505 [1]  
Level 3 of fair value hierarchy [member]      
Disclousre of Detailed Information about Reconciliation of Level3 Fair Value Measurements Explanatory [Line Items]      
Beginning Balance 18,642 36,571  
Total gains in profit or loss 15,386 16,935  
Transfer from Level 2 to Level 3   796  
New investment 5,545    
Receipt of investment return   (2,681)  
Disposals (25,650) (32,712)  
Exchange realignment 1 (267)  
Ending Balance 13,924 18,642 36,571
Unlisted Investments Classified as Equity Investments F V T P L [Member] | Level 3 of fair value hierarchy [member]      
Disclousre of Detailed Information about Reconciliation of Level3 Fair Value Measurements Explanatory [Line Items]      
Beginning Balance 10,603 26,126  
Total gains in profit or loss 15,036 16,564  
Transfer from Level 2 to Level 3   796  
Disposals (25,650) (32,712)  
Exchange realignment 11 (171)  
Ending Balance 0 10,603 26,126
Movie Income Right Investments [Member] | Level 3 of fair value hierarchy [member]      
Disclousre of Detailed Information about Reconciliation of Level3 Fair Value Measurements Explanatory [Line Items]      
Beginning Balance 8,039 10,445  
Total gains in profit or loss 350 371  
New investment 5,545    
Receipt of investment return   (2,681)  
Exchange realignment (10) (96)  
Ending Balance $ 13,924 $ 8,039 $ 10,445
[1] The comparative consolidated financial statements have been re-presented from Hong Kong dollar to US$ to reflect the Company’s change in presentation currency. See note 1.