Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2018	Feb. 28, 2017
Revenue from External Customer [Line Items]
Total revenue	$ 94,047	$ 90,970
North America [Member]
Revenue from External Customer [Line Items]
Total revenue	51,641	50,305
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue	33,014	29,844
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue	4,461	5,023
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 4,931	$ 5,798