Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 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 revenue	$ 91,271	$ 78,317	$ 78,404	$ 87,213	$ 93,544	$ 88,681	$ 90,955	$ 87,524	$ 335,205	$ 360,704	$ 351,610
North America [Member]
Revenue from External Customer [Line Items]
Total revenue									146,374	146,572	142,046
Europe Middle East Africa [Member]
Revenue from External Customer [Line Items]
Total revenue									131,151	153,206	146,643
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue									31,407	34,349	36,302
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue									$ 26,273	$ 26,577	$ 26,619