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Venture Capital Investments and Marketable Securities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 30, 2017	Sep. 24, 2016
Schedule of Equity Method Investments [Line Items]
Committed contribution	$ 87.7		$ 87.7
Venture capital investments	48.0		48.0
Dividends received	3.3	$ 2.3	7.7	$ 2.3
Gain (loss) from venture capital investments	$ 5.8	$ 0.4	$ 12.5	$ 8.5
Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	0.70%		0.70%
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	12.10%		12.10%

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Income (Loss) From Venture Capital Investments

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
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-Subparagraph (SX 210.7-04(10))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-Section 45
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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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