Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.3.0.814
Document And Entity Information - shares
9 Months Ended
Oct. 03, 2015
Nov. 10, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Oct. 03, 2015  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0000896264  
Entity Registrant Name USANA HEALTH SCIENCES INC  
Current Fiscal Year End Date --01-02  
Document Fiscal Year Focus 2015  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   12,769,551
Trading Symbol usna