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Stock-Based Compensation (Tables)
 6 Months Ended
May 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 six months ended May 31, 2017:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
12,731,545

 
$
18.95

Granted
—

 
—

Exercised
(255,623
)
 
11.93

Cancelled
(344,528
)
 
18.26

Options outstanding at end of period
12,131,394

 
$
19.12

Options exercisable at end of period
10,082,581

 
$
19.87