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Stock-Based Compensation (Outstanding and Exercisable Stock Options) (Details) (USD $)
 9 Months Ended
Aug. 31, 2014
Options  
Options outstanding at beginning of period, options 10,531,938
Granted, options 0
Exercised, options (25,000)
Cancelled, options (32,546)
Options outstanding at end of period, options 10,474,392
Options exercisable at end of period 9,400,056
Weighted Average Exercise Price in dollars per share  
Options outstanding at beginning of period, weighted average exercise price in dollars per share $ 21.11
Granted, weighted average exercise price in dollars per share $ 0.00
Exercised, weighted average exercise price in dollars per share $ 8.02
Cancelled, weighted average exercise price in dollars per share $ 19.30
Options outstanding at end of period, weighted average exercise price in dollars per share $ 21.15
Options exercisable at end of period $ 22.26