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Inventories (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Notes To Financial Statements [Abstract]    
Inventory, Raw Materials, Net of Reserves $ 300,792 $ 277,394
Inventory, Work in Process, Net of Reserves 61,856 58,663
Inventory, Finished Goods, Net of Reserves 245,836 249,642
Inventories, net $ 608,484 $ 585,699