Computation of Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Jun. 30, 2019		Mar. 31, 2019		Dec. 30, 2018		Sep. 30, 2018		Jun. 24, 2018		Mar. 25, 2018		Dec. 24, 2017		Sep. 24, 2017		Jun. 30, 2019	Jun. 24, 2018	Jun. 25, 2017
Earnings Per Share [Abstract]
Net income attributable to Unifi, Inc.	$ 1,002	[1]	$ (1,529)	[1]	$ 1,171	[1]	$ 1,812	[1]	$ 10,764	[2]	$ 176	[2]	$ 11,802	[2]	$ 8,960	[2]	$ 2,456	$ 31,702	$ 32,875
Weighted average common shares outstanding (in shares)																	18,395	18,294	18,136
Basic	$ 0.05	[3]	$ (0.08)	[3]	$ 0.06	[3]	$ 0.10	[3]	$ 0.59	[3]	$ 0.01	[3]	$ 0.65	[3]	$ 0.49	[3]	$ 0.13	$ 1.73	$ 1.81
Net potential common share equivalents – stock options and RSUs (in shares)																	300	343	307
Adjusted weighted average common shares outstanding (in shares)																	18,695	18,637	18,443
Diluted	$ 0.05	[3]	$ (0.08)	[3]	$ 0.06	[3]	$ 0.10	[3]	$ 0.58	[3]	$ 0.01	[3]	$ 0.63	[3]	$ 0.48	[3]	$ 0.13	$ 1.70	$ 1.78
Excluded from the calculation of common share equivalents:
Anti-dilutive common share equivalents (in shares)																	314	118	390

[1] Net income for the fiscal quarter ended June 30, 2019 includes severance charges for involuntary terminations.

[2] Net income for the fiscal quarter ended June 24, 2018 includes the reversal of a $3,380 uncertain tax position relating to certain income applicable to fiscal 2015. Net income for the fiscal quarter ended December 24, 2017 includes the reversal of a $3,807 valuation allowance on certain historical NOLs.

[3] Income per share is computed independently for each of the periods presented. The sum of the income per share amounts for the fiscal quarters may not equal the total for the fiscal year.