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Capitalization (Details 3) (USD $)
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Common Stock Options      
Granted (in shares) 0    
Stock option awards
     
Common Stock Options      
Outstanding at beginning of year (in shares) 2,549,000 2,867,000 2,925,000
Granted (in shares)   5,000 35,000
Exercised (in shares) (85,000) (307,000) (11,000)
Expired or forfeited (in shares)   (16,000) (82,000)
Outstanding at end of year (in shares) 2,464,000 2,549,000 2,867,000
Weighted Average Exercise Price (in dollar per share)      
Outstanding at beginning of year (in dollars per share) $ 12.82 $ 12.27 $ 12.29
Granted (in dollars per share)   $ 22.35 $ 10.03
Exercised (in dollars per share) $ 9.66 $ 8.07 $ 8.35
Expired or forfeited (in dollars per share)   $ 7.69 $ 12.77
Outstanding at end of year (in dollars per share) $ 12.93 $ 12.82 $ 12.27
Options exercisable and weighted average grant date fair value      
Options exercisable at end of year (in shares) 1,907,000 1,339,000 952,000
Weighted average grant date fair value (per share) of options granted during the period   $ 8.46 $ 4.47