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Fair Value of Financial Instruments and Non-Financial Assets and Liabilities - Additional Information (Details) - USD ($) | Sep. 30, 2018 | Sep. 24, 2017
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Fair Value Disclosures [Abstract] |  |
Fair value assets and liabilities amount transfers into or out of the levels | $ 0 | $ 0

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- Definition Fair value assets and liabilities transfers among level 1 level 2 and level 3 amount. + References No definition available. + Details
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Namespace Prefix: | ufi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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