QUARTERLY DATA (UNAUDITED) (Certain Unaudited Financial Data For Each Quarter of Fiscal 2011 and 2012) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 189,448	$ 115,926	$ 179,595	$ 127,398	$ 191,942	$ 150,297	$ 138,761	$ 148,685	$ 612,367	$ 629,685	$ 645,357
Operating income	41,445	696	33,169	29,699	49,222	20,520	24,068	39,355	105,009	133,165	122,177
Net income	$ 24,736	$ (1,037)	$ 13,740	$ 17,139	$ 26,466	$ 9,650	$ 11,873	$ 21,435	$ 54,578	$ 69,424	$ 54,531
Basic and diluted earnings per share	$ 0.53	$ (0.02)	$ 0.30	$ 0.37	$ 0.56	$ 0.20	$ 0.25	$ 0.45	$ 1.18	$ 1.46	$ 1.13