Segment Information (Schedule Of Revenue Percentage By Product) (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 29, 2018 |
Dec. 30, 2017 |
Dec. 31, 2016 |
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| USANA Nutritionals [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 82.00% | 83.00% | 83.00% |
| USANA Foods [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 9.00% | 9.00% | 10.00% |
| Sense - Beautiful Science [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 3.00% | 6.00% | 6.00% |
| Celavive [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 5.00% | ||
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