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Employee Benefit Plans (Details) (USD $)
12 Months Ended 0 Months Ended
Jan. 03, 2015
Mar. 25, 2008
Mar. 26, 2008
Long-Term Incentive Plans      
Unrecognized compensation cost related to nonvested share-based compensation arrangements $ 22,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Weighted-average period over which unrecognized compensation cost is expected to be recognized 1 year 6 months    
Nonemployee director | Restricted stock units      
Long-Term Incentive Plans      
Vesting period 1 year    
Value of awards granted $ 120,000fosl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsTotalValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= fosl_NonEmployeeDirectorMember
   
2008 LTIP      
Long-Term Incentive Plans      
Number of common shares reserved for issuance 4,685,030us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= fosl_TwoThousandEightLongTermIncentivePlanMember
   
Term of award under the plan 10 years    
Vesting period   3 years  
Initial LTIP      
Long-Term Incentive Plans      
Term of award under the plan   10 years  
Number of outstanding awards     60,085us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= fosl_InitialLongTermIncentivePlanMember
Nonemployee Plan      
Long-Term Incentive Plans      
Percentage of options granted that became exercisable on first anniversary of the date of grant   50.00%fosl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedBecameExercisableOnFirstAnniversaryOfDateOfGrant
/ us-gaap_PlanNameAxis
= fosl_NonemployeePlanMember
 
Options granted that became exercisable on second and third anniversary of the date of grant   25.00%fosl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedBecameExercisableOnSecondAndThirdAnniversaryOfDateOfGrant
/ us-gaap_PlanNameAxis
= fosl_NonemployeePlanMember
 
Number of installments in which options are exercisable   2fosl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableIntoNumberOfInstallments
/ us-gaap_PlanNameAxis
= fosl_NonemployeePlanMember
 
Number of outstanding awards     15,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= fosl_NonemployeePlanMember
Nonemployee Plan | Minimum      
Long-Term Incentive Plans      
Vesting period   3 years  
Nonemployee Plan | Maximum      
Long-Term Incentive Plans      
Vesting period   5 years