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Inventories (Tables)
3 Months Ended
Jul. 31, 2021
Inventory Disclosure [Abstract]  
Summary of Inventories Inventories consisted of the following (in thousands):
July 31, 2021April 30, 2021
Finished products$4,070 $2,988 
Work in process2,170 1,832 
Raw materials11,612 11,697 
Total$17,852 $16,517