Increase in purchase obligations.

No definition available.

Name:	ufi_IncreaseInPurchaseObligations
Namespace Prefix:	ufi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Monitoring and reporting costs of an individual site period.

+ References

No definition available.

+ Details

Name:	ufi_MonitoringAndReportingCostsOfAnIndividualSitePeriod
Namespace Prefix:	ufi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating leases amount of reduction in future minimum payments due.

+ References

No definition available.

+ Details

Name:	ufi_OperatingLeasesAmountOfReductionInFutureMinimumPaymentsDue
Namespace Prefix:	ufi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The term of a former ground lease with E.I. DuPont de Nemours.

+ References

No definition available.

+ Details

Name:	ufi_TheTermOfAFormerGroundLease
Namespace Prefix:	ufi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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_LongTermPurchaseCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

Name:	us-gaap_PurchaseObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_StatementGeographicalAxis=country_BR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_NC
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=ufi_AssetConstructionObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Sep. 30, 2004	Dec. 25, 2016	Dec. 25, 2016
Long Term Purchase Commitment [Line Items]
The Term of a Former Ground Lease	99 years
Number of Years of Monitoring and Reporting Costs of an Individual Site			7 years
Brazilian [Member] \| Subsidiary [Member]
Long Term Purchase Commitment [Line Items]
Increase in purchase obligations		$ 11,700
North Carolina [Member] \| Asset Construction Obligations [Member]
Long Term Purchase Commitment [Line Items]
Purchase Obligation		4,700	$ 4,700
Repreve Renewables LLC [Member]
Long Term Purchase Commitment [Line Items]
Reduction in future operating lease payments		$ 7,300	$ 7,300