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Inventories, net (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Inventories, net |  |  |
Raw materials | $ 57,218,000 | $ 67,775,000 |
Work in process | 53,232,000 | 43,276,000 |
Finished goods | 65,618,000 | 42,968,000 |
Inventories, gross | 176,068,000 | 154,019,000 |
Reserve for inventory excess and obsolescence | (25,900,000) | (15,205,000) |
Inventories, net | 150,168,000 | 138,814,000 |
Inventory reserve charge | $ 13,937,000 | $ 8,136,000 | $ 2,271,000

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