Noncontrolling Interest (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. 28, 2012	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Total assets	$ 2,006,113				$ 1,946,908				$ 2,006,113	$ 1,946,908
Total revenues	315,455	270,859	245,846	237,790	296,527	255,021	247,363	225,702	1,069,950	1,024,613	920,246
TS Innovations Limited
Total assets	7,100				6,100				7,100	6,100
Total revenues									$ 11,800	$ 10,500	$ 13,100
Percentage of ownership interest owned by the entity	74.90%								74.90%
Percentage of equity interest owned by noncontrolling shareholders	25.10%								25.10%