Net Income per Share - Reconciliation of Weighted Average Common Shares Used to Calculate Basic Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Earnings Per Share [Abstract]
Net income		$ 55,387	$ 65,656	$ 176,172	$ 196,669
Weighted-average common shares for basic net income per share (shares)		155,533	155,194	154,835	154,611
Dilutive effect of potential common shares from equity-based compensation (shares)		3,051	2,428	3,015	2,642
Weighted-average common shares for diluted net income per share (shares)		158,584	157,622	157,850	157,253
Basic (in USD per share)		$ 0.36	$ 0.42	$ 1.14	$ 1.27
Diluted (in USD per share)		$ 0.35	$ 0.42	$ 1.12	$ 1.25
Anti-dilutive employee stock-based awards excluded (shares)	[1]	563	2,875	1,529	2,057

[1] These employee stock-based 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.