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Stock-Based Compensation (Tables)
 6 Months Ended
May 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 six months ended May 31, 2013:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
10,105,546

 
$
21.27

Granted
—

 
—

Exercised
(112,586
)
 
13.47

Cancelled
—

 
—

Options outstanding at end of period
9,992,960

 
$
21.36

Options exercisable at end of period
8,431,121

 
$
23.88