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Inventories, net (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 26, 2019 | Oct. 27, 2018 | Oct. 26, 2019 | Oct. 27, 2018 | Apr. 30, 2019
Inventories, net |  |  |  |  |
Raw materials | $ 16,695,000 |  | $ 16,695,000 |  | $ 16,792,000
Work in process | 24,124,000 |  | 24,124,000 |  | 19,162,000
Finished goods | 22,651,000 |  | 22,651,000 |  | 25,926,000
Inventories, gross | 63,470,000 |  | 63,470,000 |  | 61,880,000
Reserve for inventory excess and obsolescence | (10,701,000) |  | (10,701,000) |  | (7,824,000)
Inventories, net | 52,769,000 |  | 52,769,000 |  | $ 54,056,000
Inventory reserve charge | 2,612,000 |  | $ 3,190,000 |  |
Impairment of long-lived assets |  | $ 841,000 |  | $ 1,190,000 |
UAS Quantix Solution |  |  |  |  |
Inventories, net |  |  |  |  |
Inventory reserve charge | $ 2,600,000,000 |  |  |  |

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