Net Income Per Share (Reconciliation Of Weighted-Average Common Shares Used To Calculate Net Income Per Share) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Apr. 30, 2012		Apr. 30, 2011		Apr. 30, 2012		Apr. 30, 2011
Net Income Per Share [Abstract]
Net income	$ 20,971		$ 81,114		$ 77,665		$ 129,340
Weighted-average common shares for basic net income per share	145,948		148,461		144,877		148,738
Dilutive effect of potential common shares from equity-based compensation	3,349		4,132		3,382		4,460
Weighted-average common shares for diluted net income per share	149,297		152,593		148,259		153,198
Anti-dilutive employee stock-based awards excluded	3,123	[1]	2,518	[1]	3,312	[1]	3,288	[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.