Summary Of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jul. 31, 2012
Goodwill And Intangible Assets [Abstract]
Balance at October 31, 2011	$ 1,289,286
Additions	348,531	[1]
Adjustments	1,067	[2]
Balance at July 31, 2012	$ 1,638,884

[1] Addition relates to acquisitions in the current period.

[2] Adjustments are primarily due to achievement of certain milestones relating to contingent consideration for an acquisition that closed prior to fiscal 2010 of $1.8 million and effects of foreign currency fluctuations of $(0.6) million.