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Inventories (Tables)
 9 Months Ended
Sep. 25, 2020
Inventory, Net [Abstract]  
Components of Inventories
Major components of inventories were as follows (in thousands):
September 25,
2020		December 27,
2019
Finished products and components$135,281 $132,128 
Products and components in various stages of completion84,588 86,957 
Raw materials and purchased components127,151 117,026 
Subtotal347,020 336,111 
Reduction to LIFO cost(63,307)(62,878)
Total$283,713 $273,233