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Credit Agreement (Details) (USD $)
 6 Months Ended
Jun. 28, 2014
May 16, 2014
Mar. 29, 2014
Dec. 28, 2013
Jun. 29, 2013
Debt Disclosure [Abstract]          
Senior credit facility, maximum borrowing capacity $ 400,000,000   $ 250,000,000    
Swing loan maximum borrowing capacity 30,000,000   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 0     0 0
Letters of credit under senior credit facility amount outstanding $ 70,900,000       $ 73,900,000
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%