Long-Term Liabilities - Additional Information (Detail) (Life Insurance Loans [Member], USD $)			3 Months Ended
	Aug. 31, 2014	May 31, 2014	Aug. 31, 2014 Minimum [Member]	Aug. 31, 2014 Maximum [Member]
Schedule Of Long Term Debt [Line Items]
Interest Rate			4.20%	7.40%
Weighted Average Interest Rate	5.90%
Prepaid Interest	$ 142,000	$ 165,000