Segment Information (Schedule Of Revenue Percentage By Product) (Details) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 28, 2019 |
Sep. 29, 2018 |
Sep. 28, 2019 |
Sep. 29, 2018 |
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| USANA Nutritionals [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 81.00% | 83.00% | 83.00% | 82.00% |
| USANA Foods [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 9.00% | 9.00% | 8.00% | 9.00% |
| Personal Care and Skincare [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 9.00% | 7.00% | 8.00% | 8.00% |
| All Other [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 1.00% | 1.00% | 1.00% | 1.00% |
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