Stock-Based Compensation (Outstanding and Exercisable Stock Options) (Details)	9 Months Ended
	Aug. 31, 2015 $ / shares shares
Options
Options outstanding at beginning of period, options | shares	11,735,042
Granted, options | shares	0
Exercised, options | shares	(52,000)
Cancelled, options | shares	(130,384)
Options outstanding at end of period, options | shares	11,552,658
Options exercisable at end of period | shares	9,992,609
Weighted Average Exercise Price in dollars per share
Options outstanding at beginning of period, weighted average exercise price in dollars per share	$ 20.45
Granted, weighted average exercise price in dollars per share	0.00
Exercised, weighted average exercise price in dollars per share	8.38
Cancelled, weighted average exercise price in dollars per share	23.26
Options outstanding at end of period, weighted average exercise price in dollars per share	20.47
Options exercisable at end of period	$ 21.32