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Stock-Based Compensation (Tables)
 9 Months Ended
Aug. 31, 2017
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 nine months ended August 31, 2017:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
12,731,545

 
$
18.95

Granted
—

 
—

Exercised
(1,204,676
)
 
17.17

Cancelled
(945,742
)
 
28.51

Options outstanding at end of period
10,581,127

 
$
18.30

Options exercisable at end of period
8,556,885

 
$
18.98