Organization, Consolidation, and Basis of Presentation (Details)	6 Months Ended
Jul. 01, 2023 region
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of geographic regions	2
Number of sub geographical regions	3

The number of sub-geographical regions the company operates in.

No definition available.

Name:	usna_NumberOfSubGeographicalRegions
Namespace Prefix:	usna_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration