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, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Revenue from External Customer [Line Items]
Segment revenue	$ 96,102	$ 93,213	$ 190,149	$ 184,183
North America
Revenue from External Customer [Line Items]
Segment revenue	50,823	51,430	102,464	101,735
EMEA
Revenue from External Customer [Line Items]
Segment revenue	35,333	30,646	68,347	60,490
Latin America
Revenue from External Customer [Line Items]
Segment revenue	4,256	5,637	8,717	10,660
Asia Pacific
Revenue from External Customer [Line Items]
Segment revenue	$ 5,690	$ 5,500	$ 10,621	$ 11,298