Investments - Non-Marketable Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Dec. 27, 2020
Net Investment Income [Line Items]
Equity securities	$ 21,000		$ 20,900
Interest income and other expense, net	$ 1,689	$ 14,039
Realized gain on partial sale of investment		2,500
Unrealized gain due to mark to market of remaining investment		7,600
Non-marketable equity securities
Net Investment Income [Line Items]
Interest income and other expense, net		$ 10,100