Income Taxes Tax rate reconciliation (Details)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
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	5.60%	4.40%	1.90%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other	1.40%	(0.30%)	1.60%
Valuation allowance reversal rate change	47.50%	9.30%	0.00%
Uncertain tax positions tax rate effect	(23.70%)	(0.50%)	(0.10%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	(3.70%)	2.60%	1.20%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent	(10.20%)	(2.30%)	0.80%
Effective Income Tax Rate Reconciliation, Other Adjustments	(0.60%)	0.60%	(0.60%)
Effective Income Tax Rate, Continuing Operations	51.30%	48.80%	39.80%