Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2017	Dec. 29, 2015	Dec. 30, 2014
Income Tax Disclosure [Abstract]
Federal income tax (benefit) expense at federal rate	$ (23,740)	$ (7,650)	$ 6,299
State income tax expense (benefit), net of federal tax	(2,975)	(960)	972
Other permanent differences	996	378	170
Foreign rate differential	214	66	6
Tax credits	(749)	(423)	(241)
Change in valuation allowance	27,353	0	0
Other items, net	134	(145)	(84)
Total provision (benefit) for income taxes	$ 1,233	$ (8,734)	$ 7,122
Effective income tax rate	(1.80%)	38.80%	38.40%