Income Taxes Effective Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 01, 2017	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax provision (benefit)		$ 6,085	$ 1	$ (9,223)
State income taxes (benefit), net of federal provision (benefit)		403	6	(749)
Change in valuation allowance	$ (30,400)	(30,374)	2,959	24,326
Employment tax credits		(5,408)	(2,710)	(2,291)
Non-deductible expenses		965	0	25
Miscellaneous		244	(256)	(323)
Provision (benefit) for income taxes		$ (28,085)	$ 0	$ 11,765