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REVENUE (Schedule Of Retained Earnings Adjustments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance			$ 409,653
Net income (loss) attributable to Fossil Group, Inc.	$ 5,006	$ (5,399)	(51,067)	$ (398,298)
Balance	$ 332,044		332,044
Difference between Revenue Guidance in Effect before and after Topic 606 | Markdowns adjustment, net of taxes
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect on retained earnings, net of tax			$ 783

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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