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Retirement Plans (Narrative) (Details) $ in Thousands | 12 Months Ended
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Aug. 31, 2020 USD ($) | Aug. 31, 2019 USD ($) item | Aug. 31, 2018 USD ($) | Aug. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | $ 1,200 | $ 1,700 | $ 1,700
Number of former executives | item |  | 5 |  |
Number of highest compensation years | item |  | 3 |  |
Discount rate, liability |  | 3.30% | 4.00% |
Discount Rate, net periodic benefit cost |  | 4.00% | 3.70% | 3.30%
Actuarial loss |  | $ (439) | $ 134 |
Scenario, Forecast [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actuarial loss | $ 200 |  |  |

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- Definition Number Of Former Executives For Which A Non-Qualified Retirement Plan Is Maintained + References No definition available. + Details
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- Definition Number Of Highest Compensation Years Of Employment That Are used In Calculation Of Plan Benefits + References No definition available. + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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