Significant Accounting Policies - Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Numerator:
Net income (loss) attributable to Fossil Group, Inc.	$ (157,088)	$ (44,157)	$ 25,434
Denominator:
Basic weighted average common shares outstanding (in shares)	52,284	51,841	51,961
Basic EPS (in dollars per share)	$ (3.00)	$ (0.85)	$ 0.49
Diluted EPS computation:
Basic weighted average common shares outstanding (in shares)	52,284	51,841	51,961
Diluted weighted average common shares outstanding (in shares)	52,284	51,841	52,777
Diluted EPS (in dollars per share)	$ (3.00)	$ (0.85)	$ 0.48
Stock Compensation Plan
Diluted EPS computation:
Shares issuable under stock-based awards not included in the diluted EPS calculation (in shares)	2,100	2,100	300
Performance Shares
Diluted EPS computation:
Shares issuable under stock-based awards not included in the diluted EPS calculation (in shares)	300	300	13,000,000