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Inventories (Details) - USD ($)
$ in Thousands
Jul. 11, 2015
Dec. 27, 2014
Jul. 12, 2014
Inventory [Line Items]      
Raw materials $ 4,074 $ 3,950 $ 5,486
Work in progress 4,044 3,967 4,286
Finished goods 23,483 15,858 16,549
Total Inventory $ 31,601 $ 23,775 $ 26,321