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Components of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 29, 2018
Current inventory:    
Raw materials $ 51,207 $ 44,655
Work in process 9,198 8,252
Finished goods 25,456 17,342
Total current inventory 85,861 70,249
Long term inventory 11,360 11,619
Total inventory $ 97,221 $ 81,868