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, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Revenue from External Customer [Line Items]
Segment revenue	$ 100,383	$ 99,995	$ 210,066	$ 189,544
North America
Revenue from External Customer [Line Items]
Segment revenue	56,564	57,060	121,977	103,558
EMEA
Revenue from External Customer [Line Items]
Segment revenue	34,157	33,633	69,145	67,005
Latin America
Revenue from External Customer [Line Items]
Segment revenue	3,346	4,108	7,346	8,569
Asia Pacific
Revenue from External Customer [Line Items]
Segment revenue	$ 6,316	$ 5,194	$ 11,598	$ 10,412