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Fair Value Measurements (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity method investment	$ 15,148	$ 13,800
Net gains on equity method investments	$ (5,623)	$ (3,685)	$ (737)
Chinese Venture Capital Fund [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Percentage of ownership interest	6.70%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Fair value portion of investments accounted under the equity method.

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