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Segment Information (Schedule Of Revenue Percentage By Product) (Details) | 12 Months Ended
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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%

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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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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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