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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2023
Apr. 30, 2022
Inventory Disclosure [Abstract]    
Finished products $ 3,800 $ 4,555
Work in process 2,725 2,893
Raw materials 14,887 16,348
Total $ 21,412 $ 23,796