Stock-Based Compensation (Details) (USD $)	3 Months Ended
	Feb. 29, 2012
Stock options outstanding and stock options exercisable
Options outstanding at beginning of period, Options	10,160,396
Stock options granted, total	15,000
Granted, Weighted Average Exercise Price	$ 9.70
Exercised, Options	0
Exercised, Weighted Average Exercise Price	$ 0.00
Cancelled, Options	(6,000)
Cancelled, Weighted Average Exercise Price	$ 16.83
Options outstanding at end of period, Options	10,169,396
Options outstanding at beginning of period, Weighted Average Exercise Price	$ 21.27
Options outstanding at end of period, Weighted Average Exercise Price	$ 21.26
Options exercisable at end of period, options	7,241,732
Options exercisable at end of period, Weighted Average Exercise Price	$ 26.27