Stock-Based Compensation (Outstanding and Exercisable Stock Options) (Details) - $ / shares	6 Months Ended
	May 31, 2020
Options
Options outstanding at beginning of period, options (in shares)	4,163,481
Granted, options (in shares)	0
Exercised, options (in shares)	(708,372)
Cancelled, options (in shares)	(6,000)
Options outstanding at end of period, options (in shares)	3,449,109
Options exercisable at end of period (in shares)	3,449,109
Weighted Average Exercise Price in dollars per share
Options outstanding at beginning of period, weighted average exercise price (in dollars per share)	$ 13.00
Granted, weighted average exercise price (in dollars per share)	0
Exercised, weighted average exercise price (in dollars per share)	11.77
Cancelled, weighted average exercise price (in dollars per share)	45.16
Options outstanding at end of period, weighted average exercise price (in dollars per share)	13.20
Options exercisable at end of period (in dollars per share)	$ 13.20