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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 25, 2020
Inventory, Net [Abstract]    
Finished products and components $ 166,922 $ 133,122
Products and components in various stages of completion 117,063 83,791
Raw materials and purchased components 185,291 129,319
Inventory gross total 469,276 346,232
Reduction to LIFO cost (86,975) (60,528)
Total $ 382,301 $ 285,704