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Stock-Based Compensation (Tables)
9 Months Ended
Aug. 31, 2015
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, 2015:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
11,735,042

 
$
20.45

Granted

 

Exercised
(52,000
)
 
8.38

Cancelled
(130,384
)
 
23.26

Options outstanding at end of period
11,552,658

 
$
20.47

Options exercisable at end of period
9,992,609

 
$
21.32