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Senior Credit Facility - Credit Agreement (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 27, 2015
Jun. 27, 2015
Dec. 27, 2014
Jun. 28, 2014
Line of Credit Facility [Line Items]          
Senior credit facility, maximum borrowing capacity $ 400,000,000 $ 400,000,000 $ 400,000,000    
Swing loan maximum borrowing capacity 30,000,000 30,000,000 $ 30,000,000    
Line of credit facility, expiration date     Oct. 31, 2016    
Long-term Line of Credit 0 0 $ 0 $ 0 $ 0
Letters of credit under senior credit facility amount outstanding $ 57,400,000 $ 57,400,000 $ 57,400,000 $ 40,700,000 $ 70,900,000
Bank's base rate 3.25% 3.25% 3.25%    
London inter-bank offer rate 0.19% 0.19% 0.19%    
Debt instrument, basis spread on variable rate 0.40%        
Commitment fee for unused capacity   0.08%      
Base Rate          
Line of Credit Facility [Line Items]          
Line of credit facility, interest rate description   bank’s base rate 3.25%      
London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Line of credit facility, interest rate description   LIBOR plus 0.19%      
Minimum          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate     0.40%    
Commitment fee for unused capacity     0.08%    
Maximum          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate     1.00%    
Commitment fee for unused capacity     0.20%