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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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