Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Revenue from External Customer [Line Items]
Total revenue	$ 88,817	$ 80,827	$ 170,198	$ 155,365
North America [Member]
Revenue from External Customer [Line Items]
Total revenue	47,520	36,827	89,644	71,413
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue	31,146	33,698	59,010	63,013
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue	4,388	5,703	9,356	10,811
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 5,763	$ 4,599	$ 12,188	$ 10,128