Employee Benefit and Stock Plans (Stock Options Outstanding and Exercisable) (Details)	12 Months Ended
	Nov. 30, 2019 $ / shares shares
Stock options outstanding and stock options exercisable
Range of Exercise Price in dollars per share, Minimum	$ 6.32
Range of Exercise Price in dollars per share, Maximum	$ 45.16
Options Outstanding, Options | shares	4,163,481
Options Outstanding, Weighted Average Exercise Price in dollars per share	$ 13.00
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 3 months 1 day
Options Exercisable, Options | shares	4,163,481
Options Exercisable, Weighted Average Exercise Price in dollars per share	$ 13.00
Options Exercisable, Weighted Average Remaining Contractual Life	4 years 3 months 30 days
$ 6.32 to $11.05
Stock options outstanding and stock options exercisable
Range of Exercise Price in dollars per share, Minimum	$ 6.32
Range of Exercise Price in dollars per share, Maximum	$ 11.05
Options Outstanding, Options | shares	953,500
Options Outstanding, Weighted Average Exercise Price in dollars per share	$ 6.37
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 10 months 30 days
Options Exercisable, Options | shares	953,500
Options Exercisable, Weighted Average Exercise Price in dollars per share	$ 6.37
$11.06 to $14.62
Stock options outstanding and stock options exercisable
Range of Exercise Price in dollars per share, Minimum	11.06
Range of Exercise Price in dollars per share, Maximum	$ 14.62
Options Outstanding, Options | shares	1,250,424
Options Outstanding, Weighted Average Exercise Price in dollars per share	$ 13.66
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 10 months 1 day
Options Exercisable, Options | shares	1,250,424
Options Exercisable, Weighted Average Exercise Price in dollars per share	$ 13.66
$14.63 to $15.44
Stock options outstanding and stock options exercisable
Range of Exercise Price in dollars per share, Minimum	14.63
Range of Exercise Price in dollars per share, Maximum	$ 15.44
Options Outstanding, Options | shares	853,000
Options Outstanding, Weighted Average Exercise Price in dollars per share	$ 14.92
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 11 months 1 day
Options Exercisable, Options | shares	853,000
Options Exercisable, Weighted Average Exercise Price in dollars per share	$ 14.92
$15.45 to $16.22
Stock options outstanding and stock options exercisable
Range of Exercise Price in dollars per share, Minimum	15.45
Range of Exercise Price in dollars per share, Maximum	$ 16.22
Options Outstanding, Options | shares	754,057
Options Outstanding, Weighted Average Exercise Price in dollars per share	$ 16.21
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 11 months 1 day
Options Exercisable, Options | shares	754,057
Options Exercisable, Weighted Average Exercise Price in dollars per share	$ 16.21
$16.23 to $45.16
Stock options outstanding and stock options exercisable
Range of Exercise Price in dollars per share, Minimum	16.23
Range of Exercise Price in dollars per share, Maximum	$ 45.16
Options Outstanding, Options | shares	352,500
Options Outstanding, Weighted Average Exercise Price in dollars per share	$ 17.12
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 9 months 1 day
Options Exercisable, Options | shares	352,500
Options Exercisable, Weighted Average Exercise Price in dollars per share	$ 17.12