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Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Investment Income, Net [Abstract]    
Interest and dividend income $ 56,754 $ 48,670
Net realized gain on investments 1,108 7,489
Investment income before fair value adjustment 57,862 56,159
Fair value adjustment, due to net unrealized (loss) gain, on equity securities held at end of period (580,838) 784,850
Investment (loss) $ (522,976)  
Investment income   $ 841,009