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Inventories, net (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Inventories, net |  |
Raw materials | $ 29,537 | $ 23,997
Work in process | 20,178 | 13,825
Finished goods | 46,809 | 44,113
Inventories, gross | 96,524 | 81,935
Reserve for inventory excess and obsolescence | (11,672) | (10,289)
Inventories, net | $ 84,852 | $ 71,646

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