Annual report pursuant to section 13 and 15(d)

Rescission Liabilities - Additional Information (Detail)

v2.4.0.8
Rescission Liabilities - Additional Information (Detail) (USD $)
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
Federal and State Claims
May 31, 2013
Director
Y
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Estimated liability for potential claim     $ 6,400,000  
Rescission liability 537,000 3,749,000    
Personal Services Agreement       7
Compensation       200,000
Incentive compensation       50,000
Capital received       $ 500,000