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, 2019	May 31, 2018		May 31, 2019	May 31, 2018
Revenue from External Customer [Line Items]
Segment revenue	$ 99,995	$ 92,864	[1]	$ 189,544	$ 188,274	[1]
North America
Revenue from External Customer [Line Items]
Segment revenue	57,060	47,351		103,558	99,549
EMEA
Revenue from External Customer [Line Items]
Segment revenue	33,633	35,049		67,005	68,345
Latin America
Revenue from External Customer [Line Items]
Segment revenue	4,108	4,243		8,569	9,185
Asia Pacific
Revenue from External Customer [Line Items]
Segment revenue	$ 5,194	$ 6,221		$ 10,412	$ 11,195

[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.