Supplemental Disclosures to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2020	Dec. 31, 2019	Jan. 01, 2019
Supplemental Cash Flow Elements [Abstract]
Interest paid (net of amounts capitalized)	$ 2,500	$ 2,800	$ 3,800
Income taxes (refunded) paid	(66)	(98)	42
Purchases of property and equipment accrued in accounts payable	$ 891	$ 2,487	$ 1,338