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Cash and Investments - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2019 USD ($) investment | Sep. 28, 2018 USD ($) | Sep. 27, 2019 USD ($) investment | Sep. 28, 2018 USD ($) | Dec. 28, 2018 USD ($) investment
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Gain (loss) on sales of investments available-for-sale | $ 0 | $ 0 | $ 0 | $ 0 |
Number of investments in an unrealized loss position | investment | 43 |  | 43 |  | 199
Other-than-temporary impairment charges on available-for-sale securities | $ 0 | $ 0 | $ 0 |  |
Beneficial ownership interest by BlackRock (more than) |  |  |  |  | 10.00%
Fair value of cash and investments managed by BlackRock | 470,800,000 |  | 470,800,000 |  | $ 298,500,000
Fair value of cash and investments managed by BlackRock in the BlackRock Liquidity Money Market Fund | 1,900,000 |  | 1,900,000 |  | $ 3,000,000.0
Payable to BlackRock | $ 9,000,000.0 |  | 9,000,000.0 |  |
Fees for advisory services paid to BlackRock |  |  | $ 200,000 |  |

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