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Acquisitions, Divestiture and Goodwill (Details) (Skagen Designs, USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 02, 2012
Mar. 31, 2012
Dec. 29, 2012
Dec. 28, 2013
Dec. 31, 2011
Business Acquisition          
Business Acquisition, cash $ 231,700,000us-gaap_PaymentsToAcquireBusinessesGross        
Common stock number of shares issued or issuable 150,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued        
Common Stock Valued 19,900,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned        
Contingent consideration liability at acquisition date 9,900,000us-gaap_BusinessCombinationContingentConsiderationLiability        
Contingent consideration liability at end of period     0fosl_ContingentConsiderationFairValueDisclosure 0fosl_ContingentConsiderationFairValueDisclosure  
Fair value of contingent consideration liability during the period resulting increase (decrease) operating expenses       9,900,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1  
Acquisition related cost   $ 600,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 8,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts   $ 600,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
Contingent equity consideration | Issuable | Maximum
          
Business Acquisition          
Common stock number of shares issued or issuable 100,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
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/ us-gaap_ContingentConsiderationByTypeAxis
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
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