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Stock-Based Compensation (Tables)
 9 Months Ended
Aug. 31, 2014
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, 2014:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
10,531,938

 
$
21.11

Granted
—

 
—

Exercised
(25,000
)
 
8.02

Cancelled
(32,546
)
 
19.30

Options outstanding at end of period
10,474,392

 
$
21.15

Options exercisable at end of period
9,400,056

 
$
22.26