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. 30, 2018	Sep. 24, 2017	Sep. 30, 2018	Sep. 24, 2017
Numerator:
Net income used in computing basic and diluted earnings per share	$ 113,855	$ 68,209	$ 530,956	$ 513,445
Denominator:
Denominator for basic earnings per share - weighted-average common shares (in shares)	165,927	169,850	166,885	173,362
Effect of dilutive securities - employee stock compensation plan (in shares)	737	838	796	941
Denominator for diluted earnings per share - adjusted weighted-average shares outstanding (in shares)	166,664	170,688	167,681	174,303
Basic (in dollars per share)	$ 0.69	$ 0.40	$ 3.18	$ 2.96
Diluted (in dollars per share)	$ 0.68	$ 0.40	$ 3.17	$ 2.95