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Inventories (Details) - USD ($) $ in Thousands | Mar. 26, 2021 | Dec. 25, 2020
--- | --- | ---
Inventory, Net [Abstract] |  |
Finished products and components | $ 149,906 | $ 133,122
Products and components in various stages of completion | 86,801 | 83,791
Raw materials and purchased components | 136,969 | 129,319
Inventory gross | 373,676 | 346,232
Reduction to LIFO cost | (62,031) | (60,528)
Total | $ 311,645 | $ 285,704

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