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Investments Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Investment Income Debt and Equity Securities [Abstract]      
Interest and dividend income $ 186,748 $ 129,953 $ 117,702
Net realized gain on sale of investments 104,905 109,547 108,924
Investment Income Before Fair Value Adjustment 291,653 239,500 226,626
Fair value adjustment, due to net unrealized gain (loss), on equity securities held at end of year 472,490 (107,466) 0
Net loss (gain) on sale of equity securities previously recognized through fair value adjustment 50,229 (75,335) 0
Investment Income $ 814,372 $ 56,699 $ 226,626