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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 190,213 $ 179,659
Work-in-process 84,431 75,754
Finished goods 272,768 262,231
Inventory, net of reserves $ 547,412 $ 517,644