Business Acquisitions - Pro Forma Consolidated Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Business Combinations [Abstract]
Gross revenues	$ 677,109	$ 689,580	$ 430,805
Net income	$ 18,421	$ 22,633	$ 22,464
Basic earnings per share (in dollars per share)	$ 1.52	$ 2.05	$ 2.19
Diluted earnings per share (in dollars per share)	$ 1.47	$ 1.95	$ 2.07