Segment Information (Summary Of Revenue By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 28, 2012	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Revenue from External Customer [Line Items]
Total revenues	$ 315,455	$ 270,859	$ 245,846	$ 237,790	$ 296,527	$ 255,021	$ 247,363	$ 225,702	$ 1,069,950	$ 1,024,613	$ 920,246
United States
Revenue from External Customer [Line Items]
Total revenues									556,298	498,059	456,862
Other Americas
Revenue from External Customer [Line Items]
Total revenues									48,792	52,816	47,870
Total Americas
Revenue from External Customer [Line Items]
Total revenues									605,090	550,875	504,732
United Kingdom
Revenue from External Customer [Line Items]
Total revenues									94,315	93,697	80,645
Other EMEA
Revenue from External Customer [Line Items]
Total revenues									266,000	276,323	245,854
Total EMEA
Revenue from External Customer [Line Items]
Total revenues									360,315	370,020	326,499
APJ
Revenue from External Customer [Line Items]
Total revenues									$ 104,545	$ 103,718	$ 89,015