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Stock-Based Compensation (Tables)
 3 Months Ended
Feb. 28, 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 three months ended February 28, 2018:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
9,265,240

 
$
17.64

Granted
—

 
—

Exercised
(268,954
)
 
10.96

Cancelled
(16,208
)
 
15.47

Options outstanding at end of period
8,980,078

 
$
17.85

Options exercisable at end of period
8,038,678

 
$
18.09