Segment Information (Summary Of Revenue By Geographic Region) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2011	Aug. 31, 2010
Total revenues	$ 228,973	$ 184,476	$ 630,735	$ 512,790
United States [Member]
Total revenues	113,469	93,040	313,005	245,174
Other Americas [Member]
Total revenues	9,355	10,276	29,147	27,117
Total Americas [Member]
Total revenues	122,824	103,316	342,152	272,291
United Kingdom [Member]
Total revenues	18,244	19,179	56,605	54,272
Other EMEA [Member]
Total revenues	64,459	44,129	168,431	133,530
Total EMEA [Member]
Total revenues	82,703	63,308	225,036	187,802
APJ [Member]
Total revenues	$ 23,446	$ 17,852	$ 63,547	$ 52,697