Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								11 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	Mar. 31, 2010	Nov. 30, 2010	Nov. 30, 2011	Dec. 31, 2009
Net revenues by geographic region
Net revenues	$ 533,983	$ 509,282	$ 727,165	$ 758,382	$ 679,812	$ 517,269	$ 667,536	$ 580,055	$ 2,192,250	$ 2,548,813	$ 2,163,261
United States [Member]
Net revenues by geographic region
Net revenues									1,882,764	2,027,887	1,895,479
Europe [Member]
Net revenues by geographic region
Net revenues									300,405	494,917	266,440
Asia (including Middle East) [Member]
Net revenues by geographic region
Net revenues									$ 9,081	$ 26,009	$ 1,342