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Credit Agreement (Details) (USD $)
 3 Months Ended
Mar. 30, 2013
Dec. 29, 2012
Mar. 31, 2012
Line of Credit Facility [Line Items]      
Senior Credit Facility, maximum borrowing capacity $ 250,000,000    
Line of Credit Facility, Expiration Date Oct. 31, 2016    
Senior Credit Facility amount outstanding 105,000,000 0 0
Percentage of additional interest added to LIBOR minimum 0.40%    
Percentage of additional interest added to LIBOR maximum 1.00%    
Percentage of additional interest added to LIBOR 0.50%    
Commitment fee minimum 0.08%    
Commitment fee maximum 0.20%    
Commitment fee for unused capacity 0.10%    
Letters Of Credit [Member]
      
Line of Credit Facility [Line Items]      
Letters of credit maximum borrowing capacity 250,000,000    
Letters of credit under senior credit facility amount outstanding 46,000,000    
Swing Loan [Member]
      
Line of Credit Facility [Line Items]      
Letters of credit maximum borrowing capacity $ 20,000,000