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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 |

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