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Inventories - Components of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 34,652 $ 31,200
Work-in-process 6,827 8,619
Finished goods 51,473 52,440
Total inventories $ 92,952 $ 92,259