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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | Apr. 10, 2019 | Sep. 30, 2004
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Commitments And Contingencies Disclosure [Abstract] |  |
The term of a former ground lease |  | 99 years
Net monitoring and reporting costs received | $ 180 |

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- Definition Net monitoring and reporting costs reveived. + References No definition available. + Details
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Namespace Prefix: | ufi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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