Segment Information (Percentage Of Total Product Revenue Contributed By Company's Nutritional And Care Products) (Details) |
3 Months Ended | 9 Months Ended | ||
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Oct. 03, 2015 |
Sep. 27, 2014 |
Oct. 03, 2015 |
Sep. 27, 2014 |
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| USANA Nutritionals [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 80.00% | 78.00% | 81.00% | 79.00% |
| USANA Foods [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 12.00% | 13.00% | 12.00% | 13.00% |
| Sense - Beautiful Science [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 7.00% | 7.00% | 6.00% | 7.00% |
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