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Credit Arrangements (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Aug. 31, 2019 | Aug. 31, 2018
Debt Instrument [Line Items] |  |
Long-term Debt | $ 116,571,000 | $ 116,775,000
Elecsys Series 2006A Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 1,571,000 | 1,775,000
Maturity date | Sep. 01, 2026 |
Effective interest rate | 1.92% |
Basis points | 0.45% |
Interest rate adjustment period | 5 years |
Elecsys Series 2006A Bond Adjusted Rate [Member] |  |
Debt Instrument [Line Items] |  |
Maturity date | Sep. 01, 2021 |
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 0 | 0
Maturity date | May 31, 2022 |
Unsecured revolving line of credit, maximum borrowing capacity outstanding | $ 50,000,000 |
Unsecured revolving line of credit, amount outstanding | 0 | 0
Line of Credit Facility, Remaining Borrowing Capacity | $ 50,000,000 |
Effective interest rate | 2.90% |
Annual commitment fee | 0.25% |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Basis points | 0.90% |
Series A Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 115,000,000 | $ 115,000,000
Face amount | $ 115,000,000 |
Maturity date | Feb. 19, 2030 |
Interest rate | 3.82% |
Current leverage ratio | 3.0 |
Maximum permitted funded debt to EBITDA leverage ratio through fiscal quarter ending May 31, 2020 | 3.5 |
Maximum [Member] | Series A Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Percentage increase in interest rate if leverage ratio exceed permitted ratio | 0.50% |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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