Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
Revenue from External Customer [Line Items]
Total revenue	$ 94,637	$ 79,274	$ 264,836	$ 234,639
North America [Member]
Revenue from External Customer [Line Items]
Total revenue	49,810	35,654	139,454	107,067
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue	30,656	32,995	89,667	96,008
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue	4,621	5,695	13,977	16,506
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 9,550	$ 4,930	$ 21,738	$ 15,058