Other Non-Current Assets - Schedule of Unaudited, Condensed Balance Sheet Information for Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Jun. 27, 2021	Sep. 27, 2020	Jun. 28, 2020
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 319,282	$ 329,067
Current liabilities	99,602	105,423
Shareholders’ equity and capital accounts	360,997	358,419	$ 320,077	$ 316,155
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule Of Equity Method Investments [Line Items]
Current assets	8,406	7,931
Non-current assets	625	659
Current liabilities	4,281	3,967
Shareholders’ equity and capital accounts	4,750	4,623
UNIFI’s portion of undistributed earnings	$ 2,318	$ 2,100