Segment Information (Schedule Of Revenue Percentage By Product) (Details) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jul. 01, 2017 |
Jun. 30, 2018 |
Jul. 01, 2017 |
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| USANA Nutritionals [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 82.00% | 84.00% | 82.00% | 85.00% |
| USANA Foods [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 9.00% | 9.00% | 9.00% | 8.00% |
| Sense - Beautiful Science [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 4.00% | 6.00% | 4.00% | 6.00% |
| Celavive [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 4.00% | 4.00% | ||
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