Annual report pursuant to Section 13 and 15(d)

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

v3.19.3.a.u2
Segment Information (Schedule Of Revenue Percentage By Product) (Details)
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
USANA Nutritionals [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 83.00% 82.00% 83.00%
USANA Foods [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 8.00% 9.00% 9.00%
Personal Care and Skincare [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 8.00% 8.00% 6.00%
All Other [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 1.00% 1.00% 2.00%