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Inventories (Details) - USD ($)
$ in Thousands
Oct. 01, 2016
Dec. 26, 2015
Oct. 03, 2015
Inventory [Line Items]      
Raw materials $ 5,467 $ 3,621 $ 4,943
Work in progress 5,093 4,297 5,168
Finished goods 32,376 17,944 30,226
Inventories $ 42,936 $ 25,862 $ 40,337