Equity in Net Assets of Non-Consolidated Investee - Financial Information of Investee (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Balance Sheet Information for Affiliate
Current assets	$ 2,197	$ 2,407
Non-current assets	558	557
Total assets	2,755	2,964
Current liabilities	6,321	1,046
Non-current liabilities	3,000	3,000
Total liabilities	9,321	4,046
Net assets	(6,566)	(1,082)
Income Statement Information for Affiliate
Revenues	3,871	6,244	$ 5,847
Net loss	(5,632)	(3,433)	(4,153)
National Vision’s share of net loss	$ (1,304)	$ (1,001)	$ (1,370)