Earnings Per Share (Reconciliation Of Earnings Per Share Basic And Diluted) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Numerator:
Net income used in computing basic and diluted earnings per share	$ 114,065	$ 140,347	$ 644,985	$ 710,011
Denominator:
Denominator for basic earnings per share - weighted-average common shares (in shares)	178,438	203,598	180,779	207,255
Effect of dilutive securities - employee stock compensation plan (in shares)	882	982	803	1,027
Denominator for diluted earnings per share - adjusted weighted-average shares outstanding (in shares)	179,320	204,580	181,582	208,282
Basic (in dollars per share)	$ 0.64	$ 0.69	$ 3.57	$ 3.43
Diluted (in dollars per share)	$ 0.64	$ 0.69	$ 3.55	$ 3.41