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Commitments and Contingencies - Additional Information (Details) |  | 9 Months Ended
--- | --- | ---
Sep. 30, 2004 | Mar. 25, 2018
Commitments And Contingencies Disclosure [Abstract] |  |
The term of a former ground lease | 99 years |
Number of years of monitoring and reporting costs of an individual site |  | 7 years

X
- Definition Monitoring and reporting costs of an individual site period. + References No definition available. + Details
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Namespace Prefix: | ufi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration