Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Schedule Of Revenue Percentage By Product) (Details)

v3.8.0.1
Segment Information (Schedule Of Revenue Percentage By Product) (Details)
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
USANA Nutritionals [Member]    
Revenue from External Customer [Line Items]    
Percentage of product revenue 83.00% 85.00%
USANA Foods [Member]    
Revenue from External Customer [Line Items]    
Percentage of product revenue 8.00% 8.00%
Sense - Beautiful Science [Member]    
Revenue from External Customer [Line Items]    
Percentage of product revenue 4.00% 6.00%
Celavive [Member]    
Revenue from External Customer [Line Items]    
Percentage of product revenue 4.00%