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Inventories (Tables)
 3 Months Ended
Mar. 27, 2020
Inventory, Net [Abstract]  
Components of Inventories

Major components of inventories were as follows (in thousands):
 
March 27,
2020
 
December 27,
2019
Finished products and components
$
151,087

 
$
132,128

Products and components in various stages of completion
86,956

 
86,957

Raw materials and purchased components
114,888

 
117,026

Subtotal
352,931

 
336,111

Reduction to LIFO cost
(63,364
)
 
(62,878
)
Total
$
289,567

 
$
273,233