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Credit Arrangements (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Aug. 31, 2020
Aug. 31, 2019
Debt Instrument [Line Items]    
Total debt $ 116,344 $ 116,571
Less current portion (195) (209)
Less debt issuance costs (467) (516)
Total long-term debt 115,682 115,846
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 0 0
Elecsys Series 2006A Bonds [Member]    
Debt Instrument [Line Items]    
Total debt 1,344 1,571
Series A Senior Notes [Member]    
Debt Instrument [Line Items]    
Total debt $ 115,000 $ 115,000