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Inventories - Components of Inventory (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 32,315 $ 31,200
Work-in-process 7,435 8,619
Finished goods 51,312 52,440
Total inventories $ 91,062 $ 92,259