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Inventories (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 81,804 $ 89,641
Work-in-process 61,673 58,643
Finished goods 164,134 188,506
Valuation reserves (7,220) (6,995)
Inventories $ 300,391 $ 329,795