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Inventories (Tables)
 6 Months Ended
Jun. 29, 2018
Inventory, Net [Abstract]  
Components of Inventories
Major components of inventories were as follows (in thousands):
 
June 29,
2018
 
December 29,
2017
Finished products and components
$
141,101

 
$
124,327

Products and components in various stages of completion
73,900

 
61,274

Raw materials and purchased components
108,083

 
103,407

Subtotal
323,084

 
289,008

Reduction to LIFO cost
(51,355
)
 
(49,659
)
Total
$
271,729

 
$
239,349