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Related-Party Transactions - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Jan. 02, 2021
Gull Global, Ltd. |  |
Related Party Transaction [Line Items] |  |
Related party transaction, ownership percentage | 41.60% |
Amarevita |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party |  | $ 175

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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 https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
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
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The ownership percentage by the related party. + References No definition available. + Details
Name: | usna_RelatedPartyTransactionOwnershipPercentage
Namespace Prefix: | usna_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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