Change in Carrying Value of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Aug. 31, 2012
Goodwill and Intangible Assets Disclosure [Line Items]
Beginning Balance	$ 451,821
Post-acquisition goodwill adjustment for the Nimbus acquisition	1,077	[1]
Foreign currency translation	3,891
Ending Balance	530,779
LogLogic, Inc
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill recorded for acquisition	73,189
Other Acquisition
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill recorded for acquisition	$ 801

[1] Pursuant to the business combinations accounting guidance, we record goodwill adjustments for the effect from changes to net assets acquired during the measurement period (up to one year from the date of an acquisition). Goodwill adjustments were not significant to our previously reported operating results or financial position.