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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 85,394 | $ 76,732
Work in process | 92,783 | 84,561
Finished goods | 114,641 | 110,388
Inventory reserves | (34,816) | (34,174)
Inventories | $ 258,002 | $ 237,507

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