Other Non-Current Assets - Schedule of Unaudited, Condensed Balance Sheet Information for Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	Dec. 26, 2021	Sep. 26, 2021	Jun. 27, 2021	Dec. 27, 2020	Sep. 27, 2020	Jun. 28, 2020
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 312,181		$ 329,067
Current liabilities	98,135		105,423
Shareholders’ equity and capital accounts	361,192	$ 360,997	358,419	$ 334,873	$ 320,077	$ 316,155
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule Of Equity Method Investments [Line Items]
Current assets	10,071		7,931
Non-current assets	662		659
Current liabilities	6,363		3,967
Shareholders’ equity and capital accounts	4,370		4,623
UNIFI’s portion of undistributed earnings	$ 2,291		$ 2,100