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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Statement Of Stockholders Equity [Abstract]        
Adjustment related to unrealized gains (losses) on available-for-sale securities income tax effects $ 78 $ 5,634 $ 2,308 $ 2,872
Dividends declared per share $ 2.68 $ 2.44 $ 2.68 $ 2.44