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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Dec. 27, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 49,253us-gaap_InventoryRawMaterialsNetOfReserves $ 45,341us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 15,728us-gaap_InventoryWorkInProcessNetOfReserves 19,649us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 76,572us-gaap_InventoryFinishedGoodsNetOfReserves 72,020us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 141,553us-gaap_InventoryNet $ 137,010us-gaap_InventoryNet