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Fair Value of Financial Instruments and Non-Financial Assets and Liabilities - Additional Information (Details) - USD ($)	Sep. 24, 2017	Sep. 25, 2016
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