Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Aug. 31, 2019	Aug. 31, 2018		Aug. 31, 2019	Aug. 31, 2018
Revenue from External Customer [Line Items]
Segment revenue	$ 106,716	$ 92,603	[1]	$ 296,260	$ 280,877	[1]
North America
Revenue from External Customer [Line Items]
Segment revenue	61,816	49,756		165,374	149,305
EMEA
Revenue from External Customer [Line Items]
Segment revenue	35,109	32,663		102,114	101,008
Latin America
Revenue from External Customer [Line Items]
Segment revenue	3,862	4,600		12,431	13,785
Asia Pacific
Revenue from External Customer [Line Items]
Segment revenue	$ 5,929	$ 5,584		$ 16,341	$ 16,779

[1] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.