Other Non-Current Assets - Schedule of Unaudited, Condensed Balance Sheet Information for Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Jun. 28, 2020	Jun. 30, 2019	Jun. 24, 2018
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 329,067	$ 254,493
Current liabilities	105,423	54,994
Shareholders’ equity and capital accounts	358,419	316,155	$ 392,845	$ 389,781
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule Of Equity Method Investments [Line Items]
Current assets	7,931	5,190
Non-current assets	659	561
Current liabilities	3,967	1,415
Shareholders’ equity and capital accounts	4,623	4,336
UNIFI’s portion of undistributed earnings	2,100
Equity Method Investment, Nonconsolidated Investee or Group of Investees | UNF and UNF America [Member]
Schedule Of Equity Method Investments [Line Items]
Current assets	7,931	5,190
Non-current assets	659	561
Current liabilities	3,967	1,415
Shareholders’ equity and capital accounts	4,623	$ 4,336
UNIFI’s portion of undistributed earnings	$ 2,100