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Interests in Joint Ventures - Summary of Detailed Information About Summarized Financial Information Joint Ventures (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2023
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
 [1]
May 01, 2021
 [1]
Apr. 30, 2020
 [1]
Disclosure of joint ventures [line items]            
Total assets $ 661,676 $ 661,676 $ 410,505 [1]   $ 395,007  
Total liabilities (140,574) (140,574) (15,060) [1]   (22,390)  
Interests in joint ventures 98,092 98,092 0      
Cash and cash equivalents 152,930 152,930 14,337 [1] $ 53,631 $ 53,631 $ 25,317
Revenue   33,066 25,271 [1] 25,251    
Loss for the period   40,140 25,840 [1] 22,134    
Other comprehensive expense for the period   (116) (4,251) [1] (467)    
Total comprehensive expense for the period   40,024 $ 21,589 [1] $ 21,667    
Joint ventures [member]            
Disclosure of joint ventures [line items]            
Total assets 359,533 359,533        
Total liabilities (226,698) (226,698)        
Net assets 132,835 $ 132,835        
Proportion of the Group's ownership   51.00%        
Group's share of net assets of joint ventures 67,746 $ 67,746        
Due from joint ventures 30,346 30,346        
Interests in joint ventures 98,092 98,092        
Cash and cash equivalents 16,009 16,009        
Amounts due to shareholders (57,914) (57,914)        
Bank borrowings (162,257) $ (162,257)        
Revenue 6,100          
Loss for the period (785)          
Other comprehensive expense for the period (165)          
Total comprehensive expense for the period (950)          
Depreciation of property, plant and equipment 2,378          
Interest expenses $ 2,722          
[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.