Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 29, 2012	Feb. 28, 2011
Net revenues by geographic region
Net revenues	$ 779,966	$ 758,382
United States [Member]
Net revenues by geographic region
Net revenues	662,639	653,896
Europe [Member]
Net revenues by geographic region
Net revenues	105,397	110,225
Asia (including Middle East) [Member]
Net revenues by geographic region
Net revenues	$ 11,930	$ (5,739)