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Inventories (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Percentage of LIFO Inventory 73.00%  
Inventories    
Finished products $ 138,767 $ 97,398
Materials and work in process 77,269 94,161
LIFO allowance (34,114) (34,381)
Total inventories $ 181,922 $ 157,178