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Operating Segments - Summary of Revenue from Customers (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Customer A [member]      
Disclosure of major customers [line items]      
Revenue     $ 2,838
Customer B [member]      
Disclosure of major customers [line items]      
Revenue   $ 2,566  
Customer C [member]      
Disclosure of major customers [line items]      
Revenue $ 4,673