Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information - shares
3 Months Ended
Mar. 30, 2019
May 03, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 30, 2019  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0000896264  
Entity Registrant Name USANA HEALTH SCIENCES INC  
Current Fiscal Year End Date --12-28  
Document Fiscal Year Focus 2019  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   23,338,643
Trading Symbol usna  
Entity Emerging Growth Company false  
Entity Small Business false