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Segment Information (Percentage Of Total Product Revenue Contributed By Company's Nutritional And Care Products) (Details)
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3 Months Ended | |
|---|---|---|
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Mar. 30, 2013
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Mar. 31, 2012
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USANA Nutritionals [Member]
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| Revenue from External Customer [Line Items] | ||
| Percentage of product revenue | 80.00% | 80.00% |
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USANA Foods [Member]
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| Revenue from External Customer [Line Items] | ||
| Percentage of product revenue | 12.00% | 11.00% |
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Sense - Beautiful Science [Member]
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| Revenue from External Customer [Line Items] | ||
| Percentage of product revenue | 6.00% | 7.00% |