Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information (USD $)
12 Months Ended
Jan. 03, 2015
Mar. 09, 2015
Jun. 27, 2014
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 03, 2015    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000896264    
Entity Registrant Name USANA HEALTH SCIENCES INC    
Current Fiscal Year End Date --01-03    
Document Fiscal Year Focus 2014    
Entity Filer Category Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Common Stock, Shares Outstanding   12,658,684dei_EntityCommonStockSharesOutstanding  
Entity Public Float     $ 518,201,000dei_EntityPublicFloat