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Stock-Based Compensation (Tables)
 3 Months Ended
Feb. 28, 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 three months ended February 28, 2017:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
12,731,545

 
$
18.95

Granted
—

 
—

Exercised
(74,854
)
 
8.85

Cancelled
(124,090
)
 
19.46

Options outstanding at end of period
12,532,601

 
$
19.01

Options exercisable at end of period
10,307,866

 
$
19.78