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Segment Information (Narrative) (Details)
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3 Months Ended |
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Apr. 04, 2015
item
segment
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| Segment Information [Abstract] | |
| Number of Reportable Segments | 1us-gaap_NumberOfReportableSegments |
| Geographic regions | 2usna_NumberOfGeographicRegions |
| Sub-geographical regions | 3usna_NumberOfSubGeographicalRegions |
| X | ||||||||||
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- Definition
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number Of Geographic Regions No definition available.
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| X | ||||||||||
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- Definition
Number Of Sub Geographical Regions No definition available.
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