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, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Earnings Per Share [Abstract]
Net income		$ 64,718	$ 55,387	$ 194,129	$ 176,172
Weighted-average common shares for basic net income per share (shares)		151,169	155,533	152,129	154,835
Dilutive effect of potential common shares from equity-based compensation (shares)		2,721	3,051	2,500	3,015
Weighted-average common shares for diluted net income per share (shares)		153,890	158,584	154,629	157,850
Basic (in USD per share)		$ 0.43	$ 0.36	$ 1.28	$ 1.14
Diluted (in USD per share)		$ 0.42	$ 0.35	$ 1.26	$ 1.12
Anti-dilutive employee stock-based awards excluded (shares)	[1]	2,270	563	1,822	1,529

[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.