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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
May 31, 2017
Aug. 31, 2016
May 31, 2016
Debt Instrument [Line Items]      
Long-term debt $ 117,026 $ 117,173 $ 117,221
Less current portion (200) (197) (196)
Total long-term debt 116,826 116,976 117,025
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Long-term debt 0 0 0
Elecsys Series 2006A Bonds [Member]      
Debt Instrument [Line Items]      
Long-term debt 2,026 2,173 2,221
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 115,000 $ 115,000 $ 115,000