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Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Investment Income, Net [Abstract]    
Interest and dividend income $ 48,670 $ 54,268
Net realized gain on investments 7,489 2,314
Investment income before fair value adjustment 56,159 56,582
Fair value adjustment, due to net unrealized gain (loss), on equity securities held at end of period 784,850 (387,427)
Investment income $ 841,009  
Investment (loss)   $ (330,845)