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Credit Agreement (Details) (USD $)
 3 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Mar. 30, 2013
Debt Disclosure [Abstract]      
Senior credit facility, maximum borrowing capacity $ 250,000,000    
Swing loan maximum borrowing capacity 20,000,000    
Line of credit facility increase option 150,000,000    
Line of credit facility, expiration date Oct. 31, 2016    
Senior credit facility amount outstanding 80,000,000 0 105,000,000
Letters of credit under senior credit facility amount outstanding $ 42,600,000   $ 46,000,000
Bank's base rate 3.25%    
London inter-bank offer rate 0.15%    
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%