Accumulated Other Comprehensive Earnings Accumulated Other Comprehensive Earnings Change in Accounting Principle (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remeasurement of deferred income taxes reclassified to retained earnings		$ 0
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings	$ 0
Tax Act Reclassification [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remeasurement of deferred income taxes reclassified to retained earnings		$ 27,064
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings	$ 198,310