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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2014
Dec. 28, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 65,975 $ 62,241
Work in process 19,508 21,698
Finished goods 86,726 77,626
Inventories $ 172,209 $ 161,565