Commitments and Contingencies (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Jan. 02, 2012	Dec. 27, 2010
Self-Insurance
Self-insured group health insurance plan, maximum coverage per participant	$ 100,000
Self-insured group health insurance plan, maximum additional coverage per plan year	50,000
Pre-determined dollar amount	1,800,000
Health insurance expense	1,400,000	1,300,000	1,400,000
Self-insurance reserve account	$ 100,000	$ 200,000
Cost of goods sold | Supplier concentration | Food and paper products
Purchase Commitments
Percentage of food and paper products to be supplied by independent distributors	80.00%