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Accumulated Other Comprehensive Income (Schedule Of Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2020 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income (loss) and interest expense |  |  |  |  |  |  |  |  | $ 3,817 | $ 7,054 | $ (1,454)
Provision for income taxes |  |  |  |  |  |  |  |  | (44,762) | (20,661) | (19,398)
Net income | $ 19,420 | $ 31,336 | $ 41,472 | $ 26,689 | $ 18,885 | $ 14,319 | $ 20,475 | $ 14,304 | $ 118,917 | 67,983 | 62,738
Unrealized Gains (Losses) On Available-For-Sale Marketable Securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income (loss) and interest expense |  |  |  |  |  |  |  |  |  | (51) | (54)
Provision for income taxes |  |  |  |  |  |  |  |  |  | 14 | 14
Net income |  |  |  |  |  |  |  |  |  | $ (37) | $ (40)

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