Segment Information (Schedule Of Revenue Percentage By Product) (Details) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 27, 2020 |
Jun. 29, 2019 |
Jun. 27, 2020 |
Jun. 29, 2019 |
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| USANA Nutritionals [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 79.00% | 83.00% | 82.00% | 84.00% |
| USANA Foods [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 12.00% | 9.00% | 10.00% | 8.00% |
| Personal Care and Skincare [Member] | ||||
| Revenue from External Customer [Line Items] | ||||
| Percentage of product revenue | 8.00% | 7.00% | 7.00% | 7.00% |
| 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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