Segment Information (Schedule Of Revenue Percentage By Product) (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 28, 2019 |
Dec. 29, 2018 |
Dec. 30, 2017 |
|
| USANA Nutritionals [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 83.00% | 82.00% | 83.00% |
| USANA Foods [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 8.00% | 9.00% | 9.00% |
| Personal Care and Skincare [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 8.00% | 8.00% | 6.00% |
| All Other [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Percentage of product revenue | 1.00% | 1.00% | 2.00% |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Percentage Of Product Revenue No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|