Leases Rent Expense Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011
Schedule of rent expense [Line Items]
Minimum rent on real property	$ 34,758	$ 20,765	$ 21,263
Additional rent based on percentage of sales	3,125	1,900	1,906
Restaurant rent expense	38,057	22,779	23,338
Restaurant Expenses [Member]
Schedule of rent expense [Line Items]
Restaurant rent expense	37,883	22,665	23,169
General and Administrative Expense [Member]
Schedule of rent expense [Line Items]
Restaurant rent expense	$ 174	$ 114	$ 169