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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Apr. 30, 2024
Apr. 30, 2023
Inventory Disclosure [Abstract]    
Finished goods $ 3,042 $ 3,412
Work-in-process 1,931 2,380
Materials and components 15,706 16,097
Total inventories $ 20,679 $ 21,889