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Credit Agreement (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 28, 2013
Dec. 28, 2013
Letters of Credit [Member]
Dec. 29, 2012
Letters of Credit [Member]
Dec. 28, 2013
Swing Line Loans [Member]
Line of Credit Facility [Line Items]        
Senior credit facility borrowings $ 250      
Borrowing Capacity       20
Credit agreement increased option 150      
Line of credit facility, maturity date Oct. 31, 2016      
Letters of credit outstanding   $ 38.2 $ 51.4  
Bank's base rate (in hundredths) 3.25%      
London Inter-Bank Offer Rate (in hundredths) 0.16%      
Percentage of additional interest, minimum (in hundredths) 0.40%      
Percentage of additional interest, maximum (in hundredths) 1.00%      
Percentage of additional interest, actual (in hundredths) 0.50%      
Commitment fee for unused capacity, minimum (in hundredths) 0.08%      
Commitment fee for unused capacity, maximum (in hundredths) 0.20%      
Line of credit unused capacity fee percentage (in hundredths) 0.10%      
Number of material covenants requiring quarterly compliance 2      
Credit agreement covenant terms The fixed charge coverage ratio compares earnings before interest, taxes, depreciation, amortization, stock compensation and rent expense (“consolidated EBITDAR”) to the sum of interest paid and rental expense (excluding any straight-line rent adjustments).  The leverage ratio compares total debt plus rental expense (excluding any straight-line rent adjustments) multiplied by a factor of six to consolidated EBITDAR.  The Senior Credit Facility also contains certain other restrictions regarding additional indebtedness, capital expenditures, business operations, guarantees, investments, mergers, consolidations and sales of assets, transactions with subsidiaries or affiliates, and liens.