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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