Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Revenue from External Customer [Line Items]
Total revenue	$ 89,481	$ 81,381
North America [Member]
Revenue from External Customer [Line Items]
Total revenue	49,065	42,125
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue	31,221	27,863
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue	3,693	4,967
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 5,502	$ 6,426