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Inventories (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Percentage of LIFO Inventory 83.00%  
Inventories    
Finished products $ 106,349 $ 101,715
Materials and work in process 95,584 81,202
LIFO allowance (27,382) (27,234)
Total inventories $ 174,551 $ 155,683