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Inventories, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Inventories, net      
Raw materials $ 42,310 $ 23,997  
Work in process 28,034 13,825  
Finished goods 32,619 44,113  
Inventories, gross 102,963 81,935  
Reserve for inventory excess and obsolescence (12,334) (10,289)  
Inventories, net 90,629 71,646  
Inventory reserve charge 2,271 $ 1,178 $ 5,377
UAS Quantix Solution      
Inventories, net      
Inventory reserve charge $ 2,600