Acquisition Pro Forma Information, Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
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	$ 1,170,627
Net income	$ 13,684	$ 12,464
Basic and diluted net income (loss) per share	$ 0.30	$ 0.28
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Restaurant sales	$ 1,114,642
Net income	$ 9,546
Basic and diluted net income (loss) per share	$ 0.21