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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2024
Apr. 30, 2023
Inventory Disclosure [Abstract]    
Finished products $ 2,491 $ 3,412
Work in process 1,608 2,380
Raw materials 17,746 16,097
Total $ 21,845 $ 21,889