Reconciliation of Weighted Average Common Shares Used to Calculate Basic Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jan. 31, 2014		Jan. 31, 2013
Net Income Loss Per Common Share [Line Items]
Net income	$ 67,696		$ 69,922
Weighted-average common shares for basic net income per share	154,066		151,477
Dilutive effect of potential common shares from equity-based compensation	2,690		3,054
Weighted-average common shares for diluted net income per share	156,756		154,531
Basic	$ 0.44		$ 0.46
Diluted	$ 0.43		$ 0.45
Anti-dilutive employee stock-based awards excluded	1,378	[1]	2,573	[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 antidilutive for the respective periods, they could be dilutive in the future.