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Business Segment, Geographic And Concentration Risk Information (Long-lived Assets by Category) (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2013
Dec. 28, 2012
Segment Reporting, Asset Reconciling Item [Line Items]    
Property, plant and equipment, net $ 150,532 $ 150,893
United States [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Property, plant and equipment, net 121,460 123,104
Rest Of World [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Property, plant and equipment, net $ 29,072 $ 27,789