Basis of Presentation and Significant Accounting Policies (Basic and Diluted Earnings (Loss) Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Numerator:
Net income (loss)	$ 3,261	$ (9,649)	$ (66,677)	$ (192,679)
Denominator:
Basic average shares outstanding	77,127	77,047	77,107	77,004
Net effect of stock options assumed to be exercised	231	0	0	0
Diluted average shares outstanding	77,358	77,047	77,107	77,004
Basic earnings (loss) per share	$ 0.04	$ (0.13)	$ (0.86)	$ (2.50)
Diluted earnings (loss) per share	$ 0.04	$ (0.13)	$ (0.86)	$ (2.50)