Stock-Based Compensation (Outstanding and Exercisable Stock Options) (Details) (USD $)	9 Months Ended
	Aug. 31, 2012
Options
Options outstanding at beginning of period	10,160,396
Granted	30,000
Exercised	0
Cancelled	(50,946)
Options outstanding at end of period	10,139,450
Options exercisable at end of period	7,286,213
Weighted Average Exercise Price
Options outstanding at beginning of period	$ 21.27
Granted	$ 9.08
Exercised	$ 0
Cancelled	$ 12.18
Options outstanding at end of period	$ 21.28
Options exercisable at end of period	$ 26.16