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Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 24, 2017 | Jun. 25, 2017 | Jun. 26, 2016
Director [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Threshold for Individual Disclosure | $ 120 | $ 120 | $ 120

X
- Definition Threshold amount of related party transactions requiring individual disclosure. + References No definition available. + Details
Name: | ufi_RelatedPartyTransactionThresholdForIndividualDisclosure
Namespace Prefix: | ufi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |