Business Segments and International Operations (Narrative) (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 Segments	Nov. 30, 2012 Segments	Nov. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments									1	2
Criteria for major customers, percentage of revenue									10.00%
Revenue	$ 90,980	$ 77,578	$ 81,705	$ 83,733	$ 86,642	$ 74,371	$ 74,128	$ 82,471	$ 333,996	$ 317,612	$ 333,610
Long-lived assets	57,030				63,071				57,030	63,071
Criteria for major customers, percentage of long-lived assets									10.00%
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue											33,500
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	53,600				57,900				53,600	57,900	59,600
Outside United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 3,400				$ 5,200				$ 3,400	$ 5,200	$ 6,600