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Inventories (Details) - USD ($)
$ in Thousands
Jun. 26, 2016
Dec. 27, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 35,345 $ 19,148
Work in process 17,011 21,063
Finished goods 21,564 21,558
Inventories 73,920 61,769
Inventory, noncurrent 7,000 6,900
Supplies inventory $ 10,600 $ 9,200