Segment Information (Summary Of Revenue By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2010	Aug. 31, 2010	May 31, 2010	Feb. 28, 2010	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009
Revenue from External Customer [Line Items]
Total revenues	$ 289,511	$ 228,973	$ 216,421	$ 185,341	$ 241,217	$ 184,476	$ 173,270	$ 155,044	$ 920,246	$ 754,007	$ 621,388
United States [Member]
Revenue from External Customer [Line Items]
Total revenues									456,862	368,391	279,226
Other Americas [Member]
Revenue from External Customer [Line Items]
Total revenues									47,870	39,633	35,936
Total Americas [Member]
Revenue from External Customer [Line Items]
Total revenues									504,732	408,024	315,162
United Kingdom [Member]
Revenue from External Customer [Line Items]
Total revenues									80,645	69,935	62,426
Other EMEA [Member]
Revenue from External Customer [Line Items]
Total revenues									245,854	204,613	194,562
Total EMEA [Member]
Revenue from External Customer [Line Items]
Total revenues									326,499	274,548	256,988
APJ [Member]
Revenue from External Customer [Line Items]
Total revenues									$ 89,015	$ 71,435	$ 49,238