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Stock-Based Compensation (Tables)
 6 Months Ended
May 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Outstanding and Exercisable Stock Options
The following table summarizes stock option transactions for the six months ended May 31, 2018:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
9,265,240

 
$
17.64

Granted
—

 
—

Exercised
(397,062
)
 
12.02

Cancelled
(16,208
)
 
15.47

Options outstanding at end of period
8,851,970

 
$
17.90

Options exercisable at end of period
7,910,570

 
$
18.16