Acquisition Pro Forma Information, 2015 Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013
2015 Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Restaurant sales	$ 918,456	$ 862,357
Net income (loss)	$ 6,447	$ (27,252)
Basic and diluted net income (loss) per share	$ 0.14	$ (0.88)
2014 Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Restaurant sales		$ 793,521	$ 800,264
Net income (loss)		$ (31,364)	$ (9,964)
Basic and diluted net income (loss) per share		$ (1.02)	$ (0.43)
Business Acquisition, Pro Forma Revenue Adjustment		$ 100,800
Business Acquisition, Pro Forma Net Income Adjustments		$ 4,800