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Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Related Party Transaction [Line Items] |  |  |
Principal owner beneficial ownership percentage | 45.56% |  |
Medicis [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount paid | $ 177 | $ 162 | $ 337
Drive Marketing [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount paid | 444 | 804 | 781
Shane Farmer, Owner Of Dark Horse Rowing, LLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount paid | $ 136 | $ 136 | $ 135

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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- Definition Principal Owner Beneficial Ownership Percentage + References No definition available. + Details
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Namespace Prefix: | usna_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=usna_DriveMarketingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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