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Credit Arrangements (Narrative) (Details) - USD ($)	12 Months Ended
	Aug. 31, 2015	Feb. 18, 2015	Aug. 31, 2014
Debt Instrument [Line Items]
Outstanding debt			$ 0
Long-term Debt	$ 117,366,000
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit, amount outstanding	$ 5,600,000
Senior Notes [Member]
Debt Instrument [Line Items]
Maturity date	Feb. 19, 2030
Long-term Debt	$ 115,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.82%
Amended Credit Facility [Member]
Debt Instrument [Line Items]
Unsecured revolving line of credit, maximum borrowing capacity		$ 50,000,000
Line of credit, amount outstanding	$ 0		$ 0
Line of Credit Facility, Remaining Borrowing Capacity	$ 44,400,000
Interest rate	1.10%
Annual commitment fee	0.25%
Amended Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis points	90.00%
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Maturity date	Sep. 01, 2026
Elecsys Series 2006A Bonds [Member] | Five Year United States Treasury Notes [Member]
Debt Instrument [Line Items]
Basis points	0.45%
Fixed rate, per annum	1.99%
Elecsys Series 2006A Bonds [Member] | Amended Credit Facility [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 2,366,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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