Document And Entity Information - shares	6 Months Ended
	Jul. 02, 2022	Aug. 05, 2022
Document Information [Line Items]
Entity Central Index Key	0000896264
Entity Registrant Name	USANA HEALTH SCIENCES INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jul. 02, 2022
Document Transition Report	false
Entity File Number	001-35024
Entity Incorporation, State or Country Code	UT
Entity Tax Identification Number	87-0500306
Entity Address, Address Line One	3838 West Parkway Blvd.
Entity Address, City or Town	Salt Lake City
Entity Address, State or Province	UT
Entity Address, Postal Zip Code	84120
City Area Code	801
Local Phone Number	954-7100
Title of 12(b) Security	Common Stock
Trading Symbol	USNA
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		19,198,303