Organization and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2012 item	Jan. 02, 2012 item	Dec. 27, 2010 item
Organization
Number of states in which the entity owns and operates restaurants	16
Fiscal Year
Number of weeks in a fiscal year	52	53	52
Company-owned
Organization
Number of company-owned restaurants	75
Franchises
Organization
Number of company-owned restaurants	50