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Business Segment Information - Additional Information (Details) - Segment | 3 Months Ended |
--- | --- | ---
Sep. 24, 2017 | Dec. 23, 2016
Segment Reporting Information [Line Items] |  |
Number of Reportable Segments | 3 |
Repreve Renewables LLC [Member] |  |
Segment Reporting Information [Line Items] |  |
Majority equity ownership interest percentage by parent |  | 60.00%

X
- Definition The parent entity's majority interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | ufi_MajorityInterestOwnershipPercentageByParent
Namespace Prefix: | ufi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ufi_RepreveRenewablesLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |