Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Segment Information (Schedule Of Revenue Percentage By Product) (Details)
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
USANA Nutritionals [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 82.00% 83.00% 83.00%
USANA Foods [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 9.00% 9.00% 10.00%
Sense - Beautiful Science [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 3.00% 6.00% 6.00%
Celavive [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 5.00%