FINANCIAL STATEMENT POLICIES (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 04, 2020	Mar. 30, 2019
Numerator:
Net income (loss) attributable to Fossil Group, Inc.	$ (85,581)	$ (12,242)
Denominator:
Basic weighted average common shares outstanding (in shares)	50,566	49,618
Basic EPS (in dollars per share)	$ (1.69)	$ (0.25)
Diluted EPS computation:
Basic weighted average common shares outstanding (in shares)	50,566	49,618
Diluted weighted average common shares outstanding (in shares)	50,566	49,618
Diluted EPS (in dollars per share)	$ (1.69)	$ (0.25)
Stock Compensation Plan
Other EPS Disclosures
Weighted shares issuable under stock-based awards not included in the diluted EPS calculation (in shares)	2,600	4,400
Performance Shares
Other EPS Disclosures
Weighted shares issuable under stock-based awards not included in the diluted EPS calculation (in shares)	300	1,100