Annual report pursuant to Section 13 and 15(d)

Rescission Liabilities - Additional Information (Detail)

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Rescission Liabilities - Additional Information (Detail) - USD ($)
May. 31, 2015
May. 31, 2014
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]    
Rescission liability $ 0 $ 378,000