Organization and Summary of Significant Accounting Policies (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Jan. 02, 2012	Dec. 27, 2010
Advertising costs
Advertising expense	$ 1.2	$ 2.1	$ 2.4
Domestic franchises
Advertising costs
Percentage of sales contributed to a national marketing fund	1.00%
Percentage of sales required to be spent on advertising in local markets	1.00%
International franchises
Advertising costs
Percentage of sales contributed to a national marketing fund	0.50%
Company-owned restaurants
Advertising costs
Percentage of sales contributed to a national marketing fund	1.00%