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Inventories (Details) - USD ($)
$ in Thousands
Sep. 24, 2021
Dec. 25, 2020
Inventory, Net [Abstract]    
Finished products and components $ 165,771 $ 133,122
Products and components in various stages of completion 110,284 83,791
Raw materials and purchased components 166,633 129,319
Inventory gross 442,688 346,232
Reduction to LIFO cost (79,756) (60,528)
Total $ 362,932 $ 285,704