Nature of Operations and Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019	Mar. 30, 2019	Dec. 29, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 60,012	$ 66,786	$ 56,478	$ 45,830
Restricted cash	2,063	1,487	697	287
Total Cash, Cash Equivalents, and Restricted Cash	$ 62,075	$ 68,273	$ 57,175	$ 46,117