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Long-Term Liabilities - Additional Information (Detail) (Life Insurance Loans [Member], USD $)
12 Months Ended
May 31, 2014
Schedule Of Long Term Debt [Line Items]  
Weighted Average Interest Rate 5.90%
Prepaid Interest $ 165,000
Minimum [Member]
 
Schedule Of Long Term Debt [Line Items]  
Interest Rate 4.20%
Maximum [Member]
 
Schedule Of Long Term Debt [Line Items]  
Interest Rate 7.40%