Reconciliation Of Weighted-Average Common Shares Used To Calculate Net Income Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Jul. 31, 2012		Jul. 31, 2011		Jul. 31, 2012		Jul. 31, 2011
Net Income Per Share [Abstract]
Net income	$ 75,656		$ 52,082		$ 153,321		$ 181,422
Weighted-average common shares for basic net income per share	147,801		144,960		145,827		147,479
Dilutive effect of potential common shares from equity-based compensation	2,843		3,085		3,268		4,119
Weighted-average common shares for diluted net income per share	150,644		148,045		149,095		151,598
Anti-dilutive employee stock-based awards excluded	3,995	[1]	5,469	[1]	3,522	[1]	3,593	[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.