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Revenue and Contract Liabilities - Schedule Of Contract Liabilities From Contract With Customers (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Oct. 01, 2022 | Jan. 01, 2022
Movement in Contract Liabilities [Roll Forward] |  |
Contract liabilities at beginning of period | $ 19,635 | $ 15,952
Increase due to deferral of revenue at end of period | 12,114 | 19,635
Decrease due to beginning contract liabilities recognized as revenue | (18,427) | (15,952)
Contract liabilities at end of period | $ 13,322 | $ 19,635

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of increase (decrease) in contract with customer liability due to deferred revenue. + References No definition available. + Details
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Namespace Prefix: | usna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Movement in Contract Liabilities + References No definition available. + Details
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Namespace Prefix: | usna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration