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Inventories (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Percentage of LIFO Inventory 83.00%  
Inventories    
Finished products $ 108,590 $ 97,398
Materials and work in process 95,927 94,161
LIFO allowance (33,928) (34,381)
Total inventories $ 170,589 $ 157,178