Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Revenue from External Customer [Line Items]
Total revenue	$ 116,079	$ 97,310	$ 93,213	$ 90,970	$ 117,724	$ 102,018	$ 96,118	$ 89,481	$ 397,572	$ 405,341	$ 377,554
United States [Member]
Revenue from External Customer [Line Items]
Total revenue									206,450	212,312	193,665
Canada [Member]
Revenue from External Customer [Line Items]
Total revenue									17,492	16,891	13,901
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue									130,359	130,818	124,171
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue									21,158	21,156	17,594
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue									$ 22,113	$ 24,164	$ 28,223