Investments in Unconsolidated Affiliates and Variable Interest Entities - Schedule of Unaudited, Condensed Balance Sheet Information for Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 24, 2018
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 294,388	$ 297,281
Noncurrent assets	158,354	163,117
Current liabilities	66,594	74,748
Noncurrent liabilities	3,408	3,389
Shareholders’ equity and capital accounts	382,740	382,261
UNIFI’s portion of undistributed earnings	42,150	42,316
Parkdale America LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Current assets	287,393	289,683
Noncurrent assets	157,527	162,242
Current liabilities	63,048	71,026
Noncurrent liabilities	3,408	3,389
Shareholders’ equity and capital accounts	378,464	377,510
UNIFI’s portion of undistributed earnings	41,408	41,429
UNF and UNF America [Member]
Schedule Of Equity Method Investments [Line Items]
Current assets	6,995	7,598
Noncurrent assets	827	875
Current liabilities	3,546	3,722
Shareholders’ equity and capital accounts	4,276	4,751
UNIFI’s portion of undistributed earnings	$ 742	$ 887