Summary of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2012		Oct. 31, 2011
Goodwill And Intangible Assets [Abstract]
Beginning Balance	$ 1,289,286		$ 1,265,843
Additions	687,195		30,717
Other adjustments	506	[1]	(7,274)	[1]
Ending Balance	$ 1,976,987		$ 1,289,286

[1] Adjustments primarily relate to changes in estimates for acquisitions that closed in the prior fiscal year for which the purchase price allocation was still preliminary, and achievement of certain milestones for an acquisition that closed prior to fiscal 2010.