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Segment Information (Schedule Of Revenue Percentage By Product) (Details) | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
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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- 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. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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