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Inventories - Components of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 35,441 $ 31,200
Work-in-process 7,937 8,619
Finished goods 47,470 52,440
Total inventories $ 90,848 $ 92,259