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Stock-Based Compensation (Tables)
 9 Months Ended
Aug. 31, 2013
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, 2013:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
10,105,546

 
$
21.27

Granted
—

 
—

Exercised
(115,208
)
 
13.51

Cancelled
—

 
—

Options outstanding at end of period
9,990,338

 
$
21.36

Options exercisable at end of period
8,476,681

 
$
23.81