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Business Segment Information - Additional Information (Details) - Segment	12 Months Ended
	Jun. 24, 2018	Dec. 23, 2016
Segment Reporting Information [Line Items]
Number of Reportable Segments	3
Renewables [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: