Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2015	Feb. 28, 2014
Revenue from External Customer [Line Items]
Total revenue	$ 81,381	$ 74,538
North America [Member]
Revenue from External Customer [Line Items]
Total revenue	42,125	34,586
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue	27,863	29,315
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue	4,967	5,108
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue	$ 6,426	$ 5,529