Organization and Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Jan. 02, 2012	Dec. 27, 2010
Long-lived assets
Asset impairment and disposal charges	$ (424)	$ (431)	$ (732)
Underperforming assets
Long-lived assets
Asset impairment and disposal charges	400
Number of underperforming restaurants	4	6	4
Underperforming assets, short-lived leases
Long-lived assets
Number of underperforming restaurants		3
Underperforming assets, previously reported as impaired
Long-lived assets
Number of underperforming restaurants	3	2	3
Total value at end of period
Long-lived assets
Long-lived assets held and used	348	647	552
Significant Unobservable Inputs (Level 3)
Long-lived assets
Long-lived assets held and used	348	647	552
Carrying value
Long-lived assets
Long-lived assets held and used	$ 700