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Long-Term Liabilities - Additional Information (Detail) - Life Insurance Loans [Member] - USD ($)	12 Months Ended
	May. 31, 2015	May. 31, 2014
Schedule Of Long-Term Debt [Line Items]
Weighted Average Interest Rate	5.20%
Prepaid Interest	$ 88,000	$ 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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