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Selected Financial Statement Data - Inventory (Details) - USD ($) $ in Thousands | Apr. 27, 2019 | Apr. 28, 2018
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Selected Financial Statement Data [Abstract] |  |
Raw materials | $ 30,789 | $ 30,570
Work-in-process | 8,239 | 8,645
Finished goods | 39,804 | 36,120
Inventories | $ 78,832 | $ 75,335

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