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Long Term Debt - Additional Information (Detail) (USD $)
6 Months Ended
Nov. 30, 2013
Debt Instrument [Line Items]  
Unsecured revolving line of credit, total amount available $ 12,000,000
Unsecured revolving line of credit, maturity date Sep. 01, 2014
Unsecured revolving line of credit, interest terms LIBOR plus 100 basis points
Unsecured revolving line of credit, spread 1.00%
Unsecured revolving line of credit, interest rate 1.17%