Segment Information (Percentage Of Total Product Revenue Contributed By Company's Nutritional And Care Products) (Details) |
12 Months Ended | ||
|---|---|---|---|
Jan. 02, 2016 |
Jan. 03, 2015 |
Dec. 28, 2013 |
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| USANA Nutritionals [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 81.00% | 79.00% | 80.00% |
| USANA Foods [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 11.00% | 13.00% | 11.00% |
| Sense - Beautiful Science [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 7.00% | 7.00% | 6.00% |
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