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. 24, 2017	Sep. 25, 2016	Sep. 24, 2017	Sep. 25, 2016
Numerator:
Net income used in computing basic and diluted earnings per share	$ 68,209	$ 114,065	$ 513,445	$ 644,985
Denominator:
Denominator for basic earnings per share - weighted-average common shares (in shares)	169,850	178,438	173,362	180,779
Effect of dilutive securities - employee stock compensation plan (in shares)	838	882	941	803
Denominator for diluted earnings per share - adjusted weighted-average shares outstanding (in shares)	170,688	179,320	174,303	181,582
Basic (in dollars per share)	$ 0.40	$ 0.64	$ 2.96	$ 3.57
Diluted (in dollars per share)	$ 0.40	$ 0.64	$ 2.95	$ 3.55