Summary of Significant Accounting Policies (Computations Of Basic And Diluted Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2015	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Net income	$ 233,748	$ 269,878	$ 255,188	$ 171,548	$ 191,559	$ 214,905	$ 186,492	$ 22,346	$ 930,362	$ 615,302	$ 531,965
Accretion of redeemable noncontrolling interest									(123)	(194)	0
Net earnings available to common stockholders									$ 930,239	$ 615,108	$ 531,965
Weighted-average common shares outstanding-basic (in shares)									74,104	73,516	72,837
Add weighted-average dilutive potential common shares - options and RSU’s to purchase common shares, net (in shares)									464	527	526
Weighted-average common shares outstanding-diluted (in shares)									74,568	74,043	73,363
Basic earnings per share (usd per share)	$ 3.15	$ 3.64	$ 3.44	$ 2.32	$ 2.59	$ 2.91	$ 2.54	$ 0.31	$ 12.55	$ 8.37	$ 7.30
Diluted earnings per share (usd per share)	$ 3.13	$ 3.62	$ 3.42	$ 2.30	$ 2.57	$ 2.89	$ 2.53	$ 0.30	$ 12.48	$ 8.31	$ 7.25