Acquisition Pro Forma Information, Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019
2019 Acquisitions [Member]
Business Acquisition [Line Items]
Restaurant sales	$ 1,568,533	$ 1,518,841
Net income	$ (25,586)	$ 27,730
Basic and diluted net income (loss) per share	$ (0.59)	$ 0.60
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Restaurant sales	$ 1,217,891
Net income	$ 13,684
Basic and diluted net income (loss) per share	$ 0.30