Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Revenue from External Customer [Line Items]
Total revenue	$ 90,980	$ 77,578	$ 81,705	$ 83,733	$ 86,642	$ 74,371	$ 74,128	$ 82,471	$ 333,996	$ 317,612	$ 333,610
United States [Member]
Revenue from External Customer [Line Items]
Total revenue									140,020	127,841	131,007
Canada [Member]
Revenue from External Customer [Line Items]
Total revenue									14,259	14,818	11,207
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenue									133,600	125,566	140,033
Latin America [Member]
Revenue from External Customer [Line Items]
Total revenue									25,370	28,335	31,039
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenue									$ 20,747	$ 21,052	$ 20,324