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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 27, 2014
Dec. 28, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 61,831 $ 62,241
Work in process 21,818 21,698
Finished goods 74,754 77,626
Inventories $ 158,403 $ 161,565