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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Schedule summarizes stock option activity      
Shares Outstanding at beginning of year 2,768,928 2,985,192 2,680,390
Shares Granted 391,175 406,700 1,434,000
Shares Exercised (105,676) (16,835) (193,684)
Shares Forfeited (278,646) (589,787) (917,126)
Shares Expired (102,030) (16,342) (18,388)
Shares Outstanding at end of year 2,673,751 2,768,928 2,985,192
Shares Options exercisable at year end 1,675,790 1,601,028 1,678,559
Shares Option expected to vest in future periods 845,256 1,069,119 1,075,473
Weighted Average exercise price, Outstanding at beginning of year $ 14.84 $ 15.69 $ 15.96
Weighted Average exercise price Granted $ 13.01 $ 11.40 $ 13.70
Weighted Average exercise price Exercised $ 15.38 $ 11.15 $ 14.22
Weighted Average exercise price Forfeited $ 17.45 $ 17.45 $ 14.22
Weighted Average exercise price Expired $ 15.69 $ 15.69 $ 24.44
Weighted Average exercise price, Outstanding at end of year $ 14.82 $ 14.84 $ 15.69
Weighted Average exercise price, Options exercisable at year end $ 16.12 $ 16.12 $ 17.01
Weighted Average exercise price, Options expected to vest in future periods $ 13.31 $ 13.31 $ 14.19
Weighted Average remaining contractual life 4 years 6 months 22 days    
Weighted Average remaining contractual life, Option exercisable at year end 4 years 6 months 16 days    
Weighted Average remaining contractual life, Option expected to vest in future periods 5 years 22 days    
Aggregate intrinsic value, Outstanding at end of year $ 17,540    
Aggregate intrinsic value, Options exercisable at year end 12,906    
Aggregate intrinsic value, Option expected to vest in future periods $ 3,986