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Significant Accounting Policies (Concentration of Risk) (Details) | 12 Months Ended
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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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