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Credit Arrangements (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Aug. 31, 2021	Aug. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 116,148	$ 116,344
Less current portion	(217)	(195)
Less debt issuance costs	(417)	(467)
Total long-term debt	115,514	115,682
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	0	0
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Total debt	1,148	1,344
Series A Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 115,000	$ 115,000

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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