Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Segment Information (Schedule Of Revenue Percentage By Product) (Details)
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
USANA Nutritionals [Member]        
Revenue from External Customer [Line Items]        
Percentage of product revenue 83.00% 83.00% 82.00% 84.00%
USANA Foods [Member]        
Revenue from External Customer [Line Items]        
Percentage of product revenue 9.00% 9.00% 9.00% 9.00%
Sense - Beautiful Science [Member]        
Revenue from External Customer [Line Items]        
Percentage of product revenue 2.00% 6.00% 4.00% 6.00%
Celavive [Member]        
Revenue from External Customer [Line Items]        
Percentage of product revenue 5.00%   4.00%