Net Income per Share (Details) (USD $) In Thousands	3 Months Ended				9 Months Ended
	Jul. 31, 2011		Jul. 31, 2010		Jul. 31, 2011		Jul. 31, 2010
Net Income per Share
Net income	$ 52,082		$ 39,327		$ 181,422		$ 211,662
Weighted-average common shares for basic net income per share	144,960		148,006		147,479		147,909
Dilutive effect of common share equivalents from equity-based compensation	3,085		3,100		4,119		3,550
Weighted-average common shares for diluted net income per share	148,045		151,106		151,598		151,459
Anti-dilutive employee stock-based awards excluded	5,469	[1]	12,188	[1]	3,593	[1]	10,995	[1]

[1] These stock options and unvested restricted stock units and restricted stock awards were anti-dilutive for the respective periods and are excluded in calculating diluted net income per share. While such awards were anti-dilutive for the respective periods, they could be dilutive in the future.