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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Dec. 27, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 9,735us-gaap_InventoryRawMaterialsNetOfReserves $ 10,646us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-progress 12,604us-gaap_InventoryWorkInProcessNetOfReserves 12,813us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 2,232us-gaap_InventoryFinishedGoodsNetOfReserves 2,089us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, Net $ 24,571us-gaap_InventoryNet $ 25,548us-gaap_InventoryNet