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Inventories (Details) - USD ($)
$ in Thousands
Mar. 28, 2025
Dec. 27, 2024
Inventory, Net [Abstract]    
Finished products and components $ 204,307 $ 197,242
Products and components in various stages of completion 114,225 114,647
Raw materials and purchased components 213,325 214,902
Subtotal 531,857 526,791
Reduction to LIFO cost (121,907) (122,115)
Total $ 409,950 $ 404,676