Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 25, 2012 restaurant	Dec. 27, 2011 restaurant	Dec. 28, 2010
Principles of Consolidation
Number of minority ownership restaurants	392	366
Fiscal Year
Length of fiscal year	364 days	364 days	364 days
Cash and Cash Equivalents
Cash and cash equivalents included receivables from credit card entity	$ 19.7	$ 5.0
Settlement period of credit card receivables, minimum	2 years
Settlement period of credit card receivables, maximum	3 years
Receivables
Minimum number of days financing receivable are past due, for considering for individual evaluation	120 days
Minimum
Fiscal Year
Length of fiscal year	364 days
Length of fiscal quarter	91 days
Maximum
Fiscal Year
Length of fiscal year	371 days
Length of fiscal quarter	98 days
Unconsolidated restaurants
Principles of Consolidation
Number of minority ownership restaurants	23	22
Unconsolidated restaurants | Minimum
Principles of Consolidation
Ownership interest (as a percent)	5.00%
Unconsolidated restaurants | Maximum
Principles of Consolidation
Ownership interest (as a percent)	10.00%