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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
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12 Months Ended | ||
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Jan. 03, 2015
item
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Dec. 28, 2013
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Dec. 29, 2012
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| Summary Of Significant Accounting Policies [Line Items] | |||
| Geographical regions | 2usna_NumberOfGeographicalRegions | ||
| Sub-geographical regions | 3usna_NumberOfSubGeographicalRegions | ||
| Fair Value, Assets And Liabilities, Level 1 Between Level 2 Transfers, Amount | $ 0usna_FairValueAssetsAndLiabilitiesLevel1BetweenLevel2TransfersAmount | $ 0usna_FairValueAssetsAndLiabilitiesLevel1BetweenLevel2TransfersAmount | |
| Non-financial assets | 0usna_NonfinancialAssetsFairValueDisclosure | 0usna_NonfinancialAssetsFairValueDisclosure | 0usna_NonfinancialAssetsFairValueDisclosure |
| Receivable from credit card processors | 6,209,000us-gaap_OtherReceivables | 5,490,000us-gaap_OtherReceivables | |
| Restricted cash | 3,222,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent | 3,296,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent | |
| Other-than-temporary impairments | 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities | ||
| Estimated Fair Value | 0us-gaap_HeldToMaturitySecuritiesFairValue | 8,642,000us-gaap_HeldToMaturitySecuritiesFairValue | |
| Accumulated undistributed earnings of subsidiaries | 12,296,000us-gaap_UndistributedEarningsOfForeignSubsidiaries | ||
| Maturity date | Feb. 01, 2024 | ||
| Credits on notes receivable | 720,000us-gaap_NotesReduction | 198,000us-gaap_NotesReduction | |
| Notes receivable | 8,519,000us-gaap_AccountsAndNotesReceivableNet | ||
| Impairment of goodwill | 0us-gaap_GoodwillImpairmentLoss | 0us-gaap_GoodwillImpairmentLoss | 0us-gaap_GoodwillImpairmentLoss |
| Impairment of indefinite-lived intangible assets | 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |
| Amount of individual claims before reimbursement | 125,000usna_MaximumAmountOfIndividualClaimsBeforeInsuranceReimbursement | ||
| Minimum percentage of projected aggregate claims before insurance reimbursement | 100.00%usna_MinimumPercentageOfProjectedAggregateClaimsBeforeInsuranceReimbursement | ||
| Self insurance program expense | 7,019,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid | 5,281,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid | 4,518,000us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid |
| Proceeds from Stock Options Exercised | 10,970,000us-gaap_ProceedsFromStockOptionsExercised | 454,000us-gaap_ProceedsFromStockOptionsExercised | 309,000us-gaap_ProceedsFromStockOptionsExercised |
| Tax benefit from equity award activity | 14,712,000usna_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensationNetOfTaxImpact | 7,075,000usna_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensationNetOfTaxImpact | 1,827,000usna_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensationNetOfTaxImpact |
| Amount available to repurchase under the stock repurchase plan | 61,181,000us-gaap_StockRepurchaseProgramAuthorizedAmount | ||
| Repurchase of common stock | 138,819,000us-gaap_PaymentsForRepurchaseOfCommonStock | 18,085,000us-gaap_PaymentsForRepurchaseOfCommonStock | 68,294,000us-gaap_PaymentsForRepurchaseOfCommonStock |
| Account renewal fee period | 12 months | ||
| Duration of product return for first order | 30 days | ||
| Duration of product return | 1 year | ||
| Percentage of sale refunded | 100.00%usna_ProductReturnPolicyPercentageRefunded | ||
| Restocking fee | 10.00%usna_ProductReturnPolicyRestockingFeePercent | ||
| Amount of returned product which could result in cancellation of distributorship | 100usna_ProductReturnPolicyAmountOfReturnedProductWhichCouldResultInCancellationOfDistributorship | ||
| Product return percentage of net sales | 0.80%usna_ProductReturnPercentageOfNetSales | 0.90%usna_ProductReturnPercentageOfNetSales | 0.80%usna_ProductReturnPercentageOfNetSales |
| Advertising expense | 4,942,000us-gaap_AdvertisingExpense | 3,650,000us-gaap_AdvertisingExpense | 3,942,000us-gaap_AdvertisingExpense |
| Research and development expense | 5,128,000us-gaap_ResearchAndDevelopmentExpense | 5,083,000us-gaap_ResearchAndDevelopmentExpense | 4,664,000us-gaap_ResearchAndDevelopmentExpense |
| Manufacturing Credits [Member] | |||
| Summary Of Significant Accounting Policies [Line Items] | |||
| Credits on notes receivable |
$ 720,000us-gaap_NotesReduction / us-gaap_StatementScenarioAxis = usna_ManufacturingCreditsMember |
$ 198,000us-gaap_NotesReduction / us-gaap_StatementScenarioAxis = usna_ManufacturingCreditsMember |
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| LIBOR [Member] | |||
| Summary Of Significant Accounting Policies [Line Items] | |||
| Basis Points |
4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available.
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| X | ||||||||||
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- Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair value of investments in debt securities classified as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total amount of payments made during the reporting period to settle insured claims and pay costs incurred in the claims settlement process. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The value of notes retired (or transferred to another entity) in noncash investing or financing transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of a stock repurchase plan authorized by an entity's Board of Directors. No definition available.
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| X | ||||||||||
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- Definition
Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Account Renewal Fee Recognition Period No definition available.
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| X | ||||||||||
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- Definition
Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation, Net Of Tax Impact No definition available.
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| X | ||||||||||
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- Definition
Duration Of Product Return No definition available.
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| X | ||||||||||
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- Definition
Duration Of Product Return, First Order No definition available.
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- Definition
Fair Value, Assets And Liabilities, Level 1 Between Level 2 Transfers, Amount No definition available.
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- Definition
Maximum Amount Of Individual Claims Before Insurance Reimbursement No definition available.
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Minimum Percentage Of Projected Aggregate Claims Before Insurance Reimbursement No definition available.
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- Definition
Nonfinancial Assets Fair Value Disclosure No definition available.
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Number Of Geographical Regions No definition available.
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Number Of Sub-Geographical Regions No definition available.
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Product Return Percentage Of Net Sales No definition available.
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Product Return Policy, Amount Of Returned Product Which Could Result In Cancellation Of Distributorship No definition available.
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- Definition
Product Return Policy, Percentage Refunded No definition available.
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- Definition
Product Return Policy, Restocking Fee Percent No definition available.
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