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REVENUE (Schedule Of Retained Earnings Adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Beginning balance | $ 409,653 |
Net income (loss) attributable to Fossil Group, Inc. | (48,273) | $ (48,186)
Cumulative effect on retained earnings, net of tax | 26,542 |
Ending balance | 334,838 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09, Markdown Adjustment |  |
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 | Accounting Standards Update 2014-09, Sales Adjustment |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Cumulative effect on retained earnings, net of tax | $ 783 |

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