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, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Revenue from External Customer [Line Items]
Total revenue	$ 93,213	$ 96,118	$ 184,183	$ 185,599
North America [Member]
Revenue from External Customer [Line Items]
Total revenue	51,430	53,392	101,735	102,457
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue	30,646	31,577	60,490	62,798
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue	5,637	4,389	10,660	8,082
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 5,500	$ 6,760	$ 11,298	$ 12,262