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Inventories (Tables)
 6 Months Ended
Jun. 26, 2020
Inventory, Net [Abstract]  
Components of Inventories
Major components of inventories were as follows (in thousands):
June 26,
2020		December 27,
2019
Finished products and components$145,299  $132,128  
Products and components in various stages of completion86,075  86,957  
Raw materials and purchased components123,941  117,026  
Subtotal355,315  336,111  
Reduction to LIFO cost(63,873) (62,878) 
Total$291,442  $273,233