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Inventories, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Inventories, net      
Raw materials $ 23,997 $ 15,988  
Work in process 13,825 10,340  
Finished goods 44,113 29,439  
Inventories, gross 81,935 55,767  
Reserve for inventory excess and obsolescence (10,289) (10,232)  
Inventories, net 71,646 45,535  
Inventory reserve charge 1,178 $ 5,377 $ 5,054
UAS Quantix Solution      
Inventories, net      
Inventory reserve charge $ 2,600