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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jul. 31, 2023
Apr. 30, 2023
Inventory Disclosure [Abstract]    
Finished products $ 3,537 $ 3,412
Work in process 2,138 2,380
Raw materials 16,451 16,097
Total $ 22,126 $ 21,889