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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 |  |

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