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Inventories (Details) - USD ($) $ in Thousands | Sep. 25, 2020 | Dec. 27, 2019
--- | --- | ---
Inventory, Net [Abstract] |  |
Finished products and components | $ 135,281 | $ 132,128
Products and components in various stages of completion | 84,588 | 86,957
Raw materials and purchased components | 127,151 | 117,026
Inventory gross | 347,020 | 336,111
Reduction to LIFO cost | (63,307) | (62,878)
Total | $ 283,713 | $ 273,233

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