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Manufacturing Consolidation Project and Tax Strategy (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2013
Schedule Of Restructuring Reserve By Type Of Cost [Line Items]  
Liability at December 28, 2012 $ 797
Costs incurred and charged to expense 2,005
Cash payments (1,972)
Liability at September 27, 2013 830
Total costs incurred to date 5,701
Total costs expected to be incurred 6,200
Termination Benefits [Member]
  
Schedule Of Restructuring Reserve By Type Of Cost [Line Items]  
Liability at December 28, 2012 504
Costs incurred and charged to expense 376
Cash payments (105)
Liability at September 27, 2013 775
Total costs incurred to date 1,276
Total costs expected to be incurred 1,592
Other Associated Costs [Member]
  
Schedule Of Restructuring Reserve By Type Of Cost [Line Items]  
Liability at December 28, 2012 293
Costs incurred and charged to expense 1,629
Cash payments (1,867)
Liability at September 27, 2013 55
Total costs incurred to date 4,425
Total costs expected to be incurred $ 4,608