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Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 24, 2022
Sep. 25, 2021
Sep. 24, 2022
Sep. 25, 2021
Investment Income, Net [Abstract]        
Interest and dividend income $ 61,455 $ 48,992 $ 172,973 $ 143,618
Net realized (loss) gain on investments (2,534) 8,391 (1,316) 32,376
Investment income before fair value adjustment 58,921 57,383 171,657 175,994
Fair value adjustment, due to net unrealized (loss) gain, on equity securities held at end of period (556,315) 72,945 (1,495,275) 986,756
Net gain on sale of equity securities previously recognized through fair value adjustment 0 0 0 (9,441)
Investment (loss) $ (497,394)   $ (1,323,618)  
Investment income   $ 130,328   $ 1,153,309