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Long-Term Liabilities - Additional Information (Detail) (Life Insurance Loans [Member], USD $)
6 Months Ended
Nov. 30, 2014
May 31, 2014
Schedule Of Long Term Debt [Line Items]    
Weighted Average Interest Rate 5.90%us-gaap_DebtWeightedAverageInterestRate  
Prepaid Interest 135,000us-gaap_PrepaidInterest $ 165,000us-gaap_PrepaidInterest
Minimum [Member]
   
Schedule Of Long Term Debt [Line Items]    
Interest Rate 4.20%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
 
Maximum [Member]
   
Schedule Of Long Term Debt [Line Items]    
Interest Rate 7.40%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember