Inventories Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Net of Reserves	$ 193,565	$ 180,559
Inventory, Work in Process, Net of Reserves	49,065	38,917
Inventory, Finished Goods, Net of Reserves	216,521	205,163
Inventories, net	$ 459,151	$ 424,639