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Inventories (Tables)
12 Months Ended
Apr. 30, 2023
Inventory Disclosure [Abstract]  
Summary of Inventories Inventories consisted of the following at April 30:
(in thousands)
20232022
Finished goods$3,412 $4,555 
Work-in-process2,380 2,893 
Materials and components16,097 16,348 
Total inventories$21,889 $23,796