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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Inventory Disclosure [Abstract]    
Finished goods $ 3,412 $ 4,555
Work-in-process 2,380 2,893
Materials and components 16,097 16,348
Total inventories $ 21,889 $ 23,796