Segment Information (Summary Of Revenue By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 28, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Revenue from External Customer [Line Items]
Total revenues	$ 296,527	$ 255,021	$ 247,363	$ 225,702	$ 289,511	$ 228,973	$ 216,421	$ 185,341	$ 1,024,613	$ 920,246	$ 754,007
United States
Revenue from External Customer [Line Items]
Total revenues									498,059	456,862	368,391
Other Americas
Revenue from External Customer [Line Items]
Total revenues									52,816	47,870	39,633
Total Americas
Revenue from External Customer [Line Items]
Total revenues									550,875	504,732	408,024
United Kingdom
Revenue from External Customer [Line Items]
Total revenues									93,697	80,645	69,935
Other EMEA
Revenue from External Customer [Line Items]
Total revenues									276,323	245,854	204,613
Total EMEA
Revenue from External Customer [Line Items]
Total revenues									370,020	326,499	274,548
APJ
Revenue from External Customer [Line Items]
Total revenues									$ 103,718	$ 89,015	$ 71,435