Stock-Based Compensation (Outstanding and Exercisable Stock Options) (Details) - $ / shares	6 Months Ended
	May 31, 2019
Options
Options outstanding at beginning of period, options (in shares)	7,237,544
Granted, options (in shares)	0
Exercised, options (in shares)	(1,097,927)
Cancelled, options (in shares)	(30,000)
Options outstanding at end of period, options (in shares)	6,109,617
Options exercisable at end of period (in shares)	5,820,743
Weighted Average Exercise Price in dollars per share
Options outstanding at beginning of period, weighted average exercise price (in dollars per share)	$ 16.02
Granted, weighted average exercise price (in dollars per share)	0.00
Exercised, weighted average exercise price (in dollars per share)	14.95
Cancelled, weighted average exercise price (in dollars per share)	38.24
Options outstanding at end of period, weighted average exercise price (in dollars per share)	16.11
Options exercisable at end of period (in dollars per share)	$ 16.10