Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v3.8.0.1
Document And Entity Information - USD ($)
12 Months Ended
Dec. 30, 2017
Feb. 23, 2018
Jul. 01, 2017
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 30, 2017    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000896264    
Entity Registrant Name USANA HEALTH SCIENCES INC    
Current Fiscal Year End Date --12-30    
Document Fiscal Year Focus 2017    
Entity Filer Category Large Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Common Stock, Shares Outstanding   24,049,381  
Entity Public Float     $ 781,769,369
Trading Symbol usna