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Share Based Payments - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended
May 31, 2016
May 31, 2015
Feb. 29, 2016
Jan. 28, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from Stock Options Exercised   $ 100,000    
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options $ 0      
Stock options granted, term 10 years      
Stock options vesting period 3 years      
Annual percentage over three years 33.33%      
Stock options weighted average grant date fair value $ 0.26 $ 1.05    
Shares available for future grants 1.9      
Restricted stock awards requisite service period 3 years      
Grant date fair value of shares vested $ 800,000 $ 1,000,000    
Compensation expenses 856,000 $ 2,104,000    
Unrecognized compensation cost $ 1,900,000      
Compensation cost of weighted average period 1 year 7 months      
2015 Equity Compensation Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 0.6      
Other Compensation Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 1.3      
Two Thousand Sixteen Equity Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       6.0
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-Free Interest Rate: 1.20% 1.30%    
Percentage Of Controlling Interest     50.00%  
Vesting dates of outstanding options 2016-07      
Expiration dates of options 2017-03      
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-Free Interest Rate: 1.20% 1.40%    
Vesting dates of outstanding options 2019-03      
Expiration dates of options 2026-04