Segment Reporting (Summary Of The Operating Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Segment Reporting Information [Line Items]
Revenue	$ 1,260,486	$ 1,138,135
Cost of revenues	198,993	175,593
Operating expenses	817,367	747,094
Total costs and expenses	1,016,360	922,687
Operating earnings (loss)	244,126	215,448
Domestic Segment
Segment Reporting Information [Line Items]
Revenue	1,131,804	1,004,965
Cost of revenues	176,361	149,269
Operating expenses	483,380	425,559
Total costs and expenses	659,741	574,828
Operating earnings (loss)	472,063	430,137
Global Segment
Segment Reporting Information [Line Items]
Revenue	128,682	133,170
Cost of revenues	22,632	26,324
Operating expenses	63,523	58,871
Total costs and expenses	86,155	85,195
Operating earnings (loss)	42,527	47,975
Other
Segment Reporting Information [Line Items]
Operating expenses	270,464	262,664
Total costs and expenses	270,464	262,664
Operating earnings (loss)	$ (270,464)	$ (262,664)