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Credit Arrangements (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Aug. 31, 2016
Aug. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 117,173 $ 117,366
Less current portion (197) (193)
Total long-term debt 116,976 117,173
Series 2006A Bonds [Member]    
Debt Instrument [Line Items]    
Long-term debt 2,200  
Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt 115,000 115,000
Senior Notes [Member] | Series 2006A Bonds [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 2,173 $ 2,366