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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	May 31, 2019	Aug. 31, 2018	May 31, 2018
Debt Instrument [Line Items]
Total debt	$ 116,622	$ 116,775	$ 116,826
Less current portion	(208)	(205)	(204)
Less unamortized debt issuance costs	(529)	(441)	(450)
Total long-term debt	115,885	116,129	116,172
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	0	0	0
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Total debt	1,622	1,775	1,826
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.

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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