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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. 30, 2017 | [1] | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income and interest expense |  |  |  |  |  |  |  |  | $ 2,598 | $ 2,457 | $ 1,552
Provision for income taxes |  |  |  |  |  |  |  |  | 19,391 | (37,499) | (33,001)
Net income | $ 63,654 | $ 4,449 | $ 18,475 | $ 11,836 | $ 41,140 | $ 10,628 | $ 15,265 | $ 20,129 | 98,414 | 87,162 | 59,330
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income and interest expense |  |  |  |  |  |  |  |  | (40) | 437 | 27
Provision for income taxes |  |  |  |  |  |  |  |  | 11 | (180) | (11)
Net income |  |  |  |  |  |  |  |  | $ (29) | $ 257 | $ 16
[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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