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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Nov. 30, 2018	Aug. 31, 2018	Nov. 30, 2017
Debt Instrument [Line Items]
Total debt	$ 116,724	$ 116,775	$ 116,926
Less current portion	(206)	(205)	(202)
Total long-term debt	116,518	116,570	116,724
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Total debt	1,724	1,775	1,926
Series A Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 115,000	$ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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