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Stock-Based Compensation (Tables)
 9 Months Ended
Aug. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Outstanding and Exercisable Stock Options The following table summarizes stock option transactions for the nine months ended August 31, 2019:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
7,237,544

 
$
16.02

Granted
—

 
—

Exercised
(1,263,505
)
 
14.78

Cancelled
(180,000
)
 
33.59

Options outstanding at end of period
5,794,039

 
$
15.75

Options exercisable at end of period
5,506,883

 
$
15.72