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Taxes (Details 5) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Taxes |  |  |
Tax at statutory rate (as a percent) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State, net of federal tax benefit (as a percent) | 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign rate differential (as a percent) | (12.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (12.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (10.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
U.S. tax on foreign income (as a percent) | 6.30%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings | 5.90%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings | 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Income tax contingencies (as a percent) | 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies | (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Valuation allowances | (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other (as a percent) | 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Provision for income taxes (as a percent) | 30.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 30.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 28.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Undistributed earnings of certain foreign subsidiaries | $ 800,600,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Unrecognized tax benefits that would favorably impact the effective tax rate in future periods if recognized | 12,800,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 9,600,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 10,700,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized tax benefits excluding interest and penalties | 5,300,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |
Accrued income tax-related interest | 1,800,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 1,200,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |
Penalties accrued | 400,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued | 400,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued |
Accrued interest (benefit) expense | 700,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | (1,000,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | (1,000,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Reconciliation of the total amounts of unrecognized tax benefits |  |  |
Balance at beginning of year | 14,314,000 us-gaap_UnrecognizedTaxBenefits | 15,549,000 us-gaap_UnrecognizedTaxBenefits | 17,974,000 us-gaap_UnrecognizedTaxBenefits
Gross increases tax positions in prior years | 4,234,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 3,310,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 1,245,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Gross decreases tax positions in prior years | (1,018,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (4,384,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (2,580,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Gross increases - current year tax positions | 3,508,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 3,575,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 2,486,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Settlements | (194,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (3,456,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (3,582,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Lapse in statute of limitations | (617,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (297,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Change due to currency revaluation | (141,000)fosl_UnrecognizedTaxBenefitsIncreaseDecreaseDueToCurrencyRevaluation | 17,000 fosl_UnrecognizedTaxBenefitsIncreaseDecreaseDueToCurrencyRevaluation | 6,000 fosl_UnrecognizedTaxBenefitsIncreaseDecreaseDueToCurrencyRevaluation
Balance at end of year | $ 20,086,000 us-gaap_UnrecognizedTaxBenefits | $ 14,314,000 us-gaap_UnrecognizedTaxBenefits | $ 15,549,000 us-gaap_UnrecognizedTaxBenefits

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