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Cover Page - shares
 6 Months Ended
Jul. 04, 2020
Aug. 10, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jul. 04, 2020  
Document Transition Report false  
Entity File Number 000-19848  
Entity Registrant Name FOSSIL GROUP, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 75-2018505  
Entity Address, Address Line One 901 S. Central Expressway,  
Entity Address, City or Town Richardson,  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75080  
City Area Code 972  
Local Phone Number 234-2525  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol FOSL  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   51,299,163
Entity Central Index Key 0000883569  
Amendment Flag false  
Current Fiscal Year End Date --01-02  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2