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Inventories (Tables)
 3 Months Ended
Mar. 30, 2018
Inventory, Net [Abstract]  
Components of Inventories
Major components of inventories were as follows (in thousands):
 
March 30,
2018
 
December 29,
2017
Finished products and components
$
137,197

 
$
124,327

Products and components in various stages of completion
77,340

 
61,274

Raw materials and purchased components
103,312

 
103,407

Subtotal
317,849

 
289,008

Reduction to LIFO cost
(50,551
)
 
(49,659
)
Total
$
267,298

 
$
239,349