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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Nov. 30, 2017
Aug. 31, 2017
Nov. 30, 2016
Debt Instrument [Line Items]      
Total debt $ 116,926 $ 116,976 $ 117,124
Less current portion (202) (201) (198)
Total long-term debt 116,724 116,775 116,926
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Total debt
Elecsys Series 2006A Bonds [Member]      
Debt Instrument [Line Items]      
Total debt 1,926 1,976 2,124
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Total debt $ 115,000 $ 115,000 $ 115,000