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Senior Credit Facility Term Loan (Details) - USD ($)
12 Months Ended
Dec. 26, 2015
Dec. 26, 2015
Dec. 27, 2014
Line of Credit Facility      
Line of credit unused capacity fee percentage (in hundredths) 0.10%    
Letters of Credit Outstanding, Amount $ 48,700,000 $ 48,700,000 $ 40,700,000
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Minimum      
Line of Credit Facility      
Line of credit unused capacity fee percentage (in hundredths) 0.075% 0.08%  
Debt Instrument, Basis Spread on Variable Rate 0.50% 0.40%  
Maximum      
Line of Credit Facility      
Line of credit unused capacity fee percentage (in hundredths) 0.20% 0.20%  
Debt Instrument, Basis Spread on Variable Rate 1.125% 1.00%  
Base Rate [Member]      
Line of Credit Facility      
Line of Credit Facility, Interest Rate Description 0.0350    
London Interbank Offered Rate (LIBOR) [Member]      
Line of Credit Facility      
Line of Credit Facility, Interest Rate Description .0042    
2016 Senior Credit Facility [Member]      
Line of Credit Facility      
Unsecured Long-term Debt, Noncurrent $ 200,000,000 $ 200,000,000  
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000,000 $ 500,000,000