Credit Agreement (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Line of Credit Facility [Line Items]
Senior credit facility borrowings	$ 250	$ 350
Credit agreement increased option		150
Line of credit facility, maturity date	Oct. 31, 2016
Bank's base rate (in hundredths)	3.25%
London Inter-Bank Offer Rate (in hundredths)	0.21%
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.
Letters of Credit [Member]
Line of Credit Facility [Line Items]
Borrowing Capacity	250	75
Letters of credit outstanding	51.4	15.0
Swing Line Loans [Member]
Line of Credit Facility [Line Items]
Borrowing Capacity	$ 20	$ 20