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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Nov. 30, 2016
Aug. 31, 2016
Nov. 30, 2015
Debt Instrument [Line Items]      
Long-term debt $ 117,124 $ 117,173 $ 117,318
Less current portion (198) (197) (194)
Total long-term debt 116,926 116,976 117,124
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 2,124 2,173 2,318
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 115,000 $ 115,000 $ 115,000