Income Taxes Tax rate reconciliation (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	1.50%	5.20%	1.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other	1.60%	0.70%	0.60%
Valuation allowance reversal rate change	0.00%	(73.90%)	0.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	0.00%	0.00%	(33.40%)
Uncertain tax positions tax rate effect	1.20%	(4.70%)	1.10%
Effective Income Tax Rate Reconciliation, Other Adjustments	(3.10%)
Income Tax Reconciliation, Other Reconciling Items		$ (0.021)	$ 0.023
Effective Income Tax Rate, Continuing Operations	36.20%	(39.80%)	7.20%