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REVENUE (Schedule Of Retained Earnings Adjustments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
12/30/2017     $ 409,653  
Net income (loss) attributable to Fossil Group, Inc. $ (7,800) $ (344,712) (56,073) $ (392,898)
June 30, 2018 $ 327,038   327,038  
Difference between Revenue Guidance in Effect before and after Topic 606 | Markdowns adjustment, net of taxes        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative effect on retained earnings, net of tax     (27,325)  
Difference between Revenue Guidance in Effect before and after Topic 606 | Sales adjustment, net of taxes        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative effect on retained earnings, net of tax     $ 783