Basis of Presentation; Condensed Notes (Policies)	6 Months Ended
Dec. 29, 2019
Accounting Policies [Abstract]
Fiscal Period	The fiscal quarter for each of Unifi, Inc., its primary domestic operating subsidiaries and its subsidiary in El Salvador ended on December 29, 2019, the Sunday nearest to December 31, 2019. Unifi, Inc.’s remaining material operating subsidiaries’ fiscal quarter ended on December 31, 2019. There were no significant transactions or events that occurred between Unifi, Inc.’s fiscal quarter end and such wholly owned subsidiaries’ subsequent fiscal quarter end. The three-month periods ended December 29, 2019 and December 30, 2018 consisted of 13 weeks. For the primary subsidiaries in the U.S. and Central America, the six-month period ended December 29, 2019 consisted of 26 weeks and the six-month period ended December 30, 2018 consisted of 27 weeks.

Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=108774443&loc=d3e5291-111683

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.3A-02(b))
-URI http://asc.fasb.org/extlink&oid=116822174&loc=d3e355033-122828

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.3A-03(b))
-URI http://asc.fasb.org/extlink&oid=116822174&loc=d3e355100-122828

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