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, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Revenue from External Customer [Line Items]
Total revenue	$ 102,018	$ 94,637	$ 287,617	$ 264,836
North America [Member]
Revenue from External Customer [Line Items]
Total revenue	58,275	49,810	160,732	139,454
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue	32,719	30,656	95,517	89,667
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue	4,667	4,621	12,749	13,977
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 6,357	$ 9,550	$ 18,619	$ 21,738