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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 28, 2019
Feb. 21, 2020
Jun. 29, 2019
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 28, 2019    
Entity File Number 001-35024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000896264    
Entity Registrant Name USANA HEALTH SCIENCES, INC.    
Entity Incorporation, State or Country Code UT    
Current Fiscal Year End Date --12-28    
Document Fiscal Year Focus 2019    
Entity Tax Identification Number 87-0500306    
Entity Public Float     $ 1,039,778,733
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, Par Value $0.001 per share    
Trading Symbol USNA    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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   21,548,542  
Documents Incorporated by Reference DOCUMENTS INCORPORATED BY REFERENCE

The registrant incorporates by reference into Part III (Items 10, 11, 12, 13, and 14) of this report certain information contained in its Definitive Proxy Statement to be filed with the Securities and Exchange Commission no later than 120 days after the end of the registrant’s fiscal year ended December 28, 2019, in connection with the registrant’s 2020 Annual Meeting of Shareholders to be held May 1, 2020.