Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Segment Information (Schedule Of Revenue Percentage By Product) (Details)
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
USANA Nutritionals [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 83.00% 81.00% 79.00%
USANA Foods [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 10.00% 11.00% 13.00%
Sense - Beautiful Science [Member]      
Revenue from External Customer [Line Items]      
Percentage of product revenue 6.00% 7.00% 7.00%