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Inventories (Components Of Inventories) (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
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Inventory, Net [Abstract] |  |
Raw materials | $ 80,700 | $ 63,384
Work-in-process | 55,875 | 51,176
Finished goods | 45,219 | 43,607
Inventories | $ 181,794 | $ 158,167

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