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Retirement Plans (Schedule of Expected Benefit Payments) (Details) - USD ($) $ in Thousands | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
--- | --- | --- | ---
Compensation And Retirement Disclosure [Abstract] |  |  |
2019 | $ 518 |  |
2020 | 511 |  |
2021 | 504 |  |
2022 | 496 |  |
2023 | 487 |  |
Thereafter | 3,889 |  |
Net amount recognized | $ 6,404 | $ 6,825 | $ 7,426

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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