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Significant Accounting Policies (Concentration of Risk) (Details)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Non-Swiss watch assembly | Production | Production concentration
Concentration of Risk
Concentration risk percentage	49.00%
Licensed products | Sales of licensed products | Licensed products
Concentration of Risk
Concentration risk percentage	46.60%	47.00%	47.60%
MICHAEL KORS | Sales of licensed products | Licensed products
Concentration of Risk
Concentration risk percentage	22.60%	22.60%	22.70%

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