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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 45,341us-gaap_InventoryRawMaterialsNetOfReserves $ 62,241us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 19,649us-gaap_InventoryWorkInProcessNetOfReserves 21,698us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 72,020us-gaap_InventoryFinishedGoodsNetOfReserves 77,626us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories, net $ 137,010us-gaap_InventoryNet $ 161,565us-gaap_InventoryNet