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Fair Value Measures - Narrative (Details) - USD ($) | Oct. 01, 2022 | Jan. 01, 2022
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Fair Value Disclosures [Line Items] |  |
Nonfinancial assets, fair value disclosure | $ 0 | $ 0

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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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of nonfinancial assets measured at fair value. + References No definition available. + Details
Name: | usna_NonfinancialAssetsFairValueDisclosure
Namespace Prefix: | usna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant