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Note L - Segment Information - Schedule of Revenue Percentage By Product (Details) - Product Concentration Risk [Member] - Revenue Benchmark [Member]
12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Dec. 28, 2019
USANA Nutritionals [Member]      
Percentage of product revenue 86.00% 85.00% 83.00%
USANA Foods [Member]      
Percentage of product revenue [1] 7.00% 7.00% 8.00%
Personal Care and Skincare [Member]      
Percentage of product revenue 6.00% 7.00% 8.00%
All Other [Member]      
Percentage of product revenue 1.00% 1.00% 1.00%
[1] Includes the Company's new Active Nutrition line, which launched in five markets late in the first quarter of 2021 and will roll out to additional markets throughout the year.