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Inventories (Tables)
 9 Months Ended
Sep. 28, 2018
Inventory, Net [Abstract]  
Components of Inventories
Major components of inventories were as follows (in thousands):
 
September 28,
2018
 
December 29,
2017
Finished products and components
$
145,077

 
$
124,327

Products and components in various stages of completion
75,706

 
61,274

Raw materials and purchased components
113,349

 
103,407

Subtotal
334,132

 
289,008

Reduction to LIFO cost
(56,406
)
 
(49,659
)
Total
$
277,726

 
$
239,349