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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. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | [1] | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income and interest expense |  |  |  |  |  |  |  |  | $ (1,454) | $ 2,598 | $ 2,457
Provision for income taxes |  |  |  |  |  |  |  |  | (19,398) | 19,391 | (37,499)
Net income | $ 13,245 | $ 14,207 | $ 19,095 | $ 16,191 | $ 63,654 | $ 4,449 | $ 18,475 | $ 11,836 | 62,738 | 98,414 | 87,162
Unrealized Gain 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 and interest expense |  |  |  |  |  |  |  |  | (54) | (40) | 437
Provision for income taxes |  |  |  |  |  |  |  |  | 14 | 11 | (180)
Net income |  |  |  |  |  |  |  |  | $ (40) | $ (29) | $ 257
[1] | The quarter ended December 30, 2017 includes the tax benefit of $49.3 million as a result of revaluing the Company's net deferred tax liability using the enacted Federal tax rate of 21% under the Tax Reform.

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