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Revenue And Contract Liabilities (Schedule Of Contract Liabilities From Contract With Customers) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 29, 2019 | Dec. 29, 2018
Revenue And Contract Liabilities [Abstract] |  |
Contract liabilities at beginning of period | $ 15,055 | $ 14,417
Increase due to deferral of revenue at period end | 13,798 | 15,055
Decrease due to beginning contract liabilities recognized as revenue | (14,546) | (14,417)
Contract liabilities at end of period | $ 14,307 | $ 15,055

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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 http://asc.fasb.org/extlink&oid=118944033&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 http://asc.fasb.org/extlink&oid=118956577&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 http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Contract with Customer, Liability, Increase (Decrease) In Deferred Revenue + References No definition available. + Details
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Namespace Prefix: | usna_
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- Definition Contract with Customer, Liability, Increase (Decrease) Revenue Recognized + References No definition available. + Details
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Namespace Prefix: | usna_
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