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Long-Term Liabilities - Additional Information (Detail) (Life Insurance Loans [Member], USD $) | 12 Months Ended
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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%

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