Earnings Per Share (Reconciliation Of Earnings Per Share Basic And Diluted) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
Numerator:
Net income used in computing basic and diluted earnings per share	$ 258,867	$ 280,431	$ 445,236	$ 530,920
Denominator:
Denominator for basic earnings per share - weighted-average common shares (in shares)	174,409	180,587	175,178	181,976
Effect of dilutive securities - employee stock compensation plan (in shares)	915	752	992	764
Denominator for diluted earnings per share - adjusted weighted-average shares outstanding (in shares)	175,324	181,339	176,170	182,740
Basic (in dollars per share)	$ 1.48	$ 1.55	$ 2.54	$ 2.92
Diluted (in dollars per share)	$ 1.48	$ 1.55	$ 2.53	$ 2.91