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Inventories, net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Inventories, net |  |  |
Raw materials | $ 67,775 | $ 42,310 |
Work in process | 43,276 | 28,034 |
Finished goods | 42,968 | 32,619 |
Inventories, gross | 154,019 | 102,963 |
Reserve for inventory excess and obsolescence | (15,205) | (12,334) |
Inventories, net | 138,814 | 90,629 |
Inventory reserve charge | $ 8,136 | $ 2,271 | $ 1,178

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