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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Summary of long-term debt    
Bank Notes $ 142,660us-gaap_LongTermDebt $ 142,500us-gaap_LongTermDebt
Less: current maturities (5,000)us-gaap_LongTermDebtCurrent (7,500)us-gaap_LongTermDebtCurrent
Long-term debt $ 137,660us-gaap_LongTermDebtNoncurrent $ 135,000us-gaap_LongTermDebtNoncurrent