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Inventories, net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Inventories, net |  |  |
Raw materials | $ 15,988 | $ 16,792 |
Work in process | 10,340 | 19,162 |
Finished goods | 29,439 | 25,926 |
Inventories, gross | 55,767 | 61,880 |
Reserve for inventory excess and obsolescence | (10,232) | (7,824) |
Inventories, net | 45,535 | 54,056 |
Inventory reserve charge | 5,377 | $ 5,054 | $ 2,758
UAS Quantix Solution |  |  |
Inventories, net |  |  |
Inventory reserve charge | $ 2,600 |  |

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