Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.8.0.1
Document And Entity Information - shares
3 Months Ended
Mar. 31, 2018
May 04, 2018
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2018  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0000896264  
Entity Registrant Name USANA HEALTH SCIENCES INC  
Current Fiscal Year End Date --12-29  
Document Fiscal Year Focus 2018  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   24,176,523
Trading Symbol usna