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Credit Arrangements (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Aug. 31, 2022
Aug. 31, 2021
Debt Instrument [Line Items]    
Total debt $ 115,931 $ 116,148
Less current portion (222) (217)
Less debt issuance costs (368) (417)
Total long-term debt 115,341 115,514
Elecsys Series 2006A Bonds [Member]    
Debt Instrument [Line Items]    
Total debt 931 1,148
Series A Senior Notes [Member]    
Debt Instrument [Line Items]    
Total debt $ 115,000 $ 115,000