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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Apr. 30, 2022
Apr. 30, 2021
Inventory Disclosure [Abstract]    
Finished goods $ 4,555 $ 2,988
Work-in-process 2,893 1,832
Materials and components 16,348 11,697
Total inventories $ 23,796 $ 16,517