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Cash and Investments - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 03, 2020 USD ($) investment | Jun. 28, 2019 USD ($) | Jul. 03, 2020 USD ($) investment | Jun. 28, 2019 USD ($) | Jan. 03, 2020 USD ($) investment
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Interest receivable | $ 5,300,000 |  | $ 5,300,000 |  | $ 6,200,000
Gain (loss) on sales of investments available-for-sale | $ 0 | $ 0 | $ 0 | $ 0 |
Number of investments in an unrealized loss position | investment | 17 |  | 17 |  | 9
Allowance for credit losses | $ 0 | $ 0 | $ 0 | $ 0 |

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