Fair Value of Financial Instruments and Non-Financial Assets and Liabilities - Additional Information (Details) - USD ($)	Dec. 24, 2017	Dec. 25, 2016
Fair Value Disclosures [Abstract]
Fair value assets and liabilities amount transfers into or out of the levels	$ 0	$ 0

Fair value assets and liabilities transfers among level 1 level 2 and level 3 amount.

No definition available.

Name:	ufi_FairValueAssetsAndLiabilitiesTransfersAmongLevel1Level2AndLevel3Amount
Namespace Prefix:	ufi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant