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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Feb. 28, 2023	Aug. 31, 2022	Feb. 28, 2022
Debt Instrument [Line Items]
Total debt	$ 115,822	$ 115,931	$ 116,042
Less current portion	(224)	(222)	(220)
Less unamortized debt issuance costs	(345)	(368)	(394)
Total long-term debt	115,253	115,341	115,428
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Total debt	822	931	1,042
Series A Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 115,000	$ 115,000	$ 115,000

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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