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
		Jan. 31, 2016	Jan. 31, 2015
Earnings Per Share [Abstract]
Net income		$ 60,035	$ 65,189
Weighted-average common shares for basic net income per share (shares)		152,968	154,458
Dilutive effect of potential common shares from equity-based compensation (shares)		2,315	2,748
Weighted-average common shares for diluted net income per share (shares)		155,283	157,206
Basic (in USD per share)		$ 0.39	$ 0.42
Diluted (in USD per share)		$ 0.39	$ 0.41
Anti-dilutive employee stock-based awards excluded (shares)	[1]	2,441	2,440

[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.