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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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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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