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Stockholders' Equity (Details 5) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
Summary of future expense for awards outstanding  
Stock options Unrecognized Compensation Cost $ 3,382
Non-vested stock awards, Unrecognized Compensation Cost 5,625
Total, Unrecognized Compensation Cost $ 9,007
Stock options, Weighted Average Remaining Vesting Period (in years) 2 years 1 month 17 days
Non-vested stock awards, Weighted Average Remaining Vesting Period (in years) 2 years 4 months 13 days
Total, Weighted Average Remaining Vesting Period (in years) 2 years 3 months 11 days