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Retirement Plans (Schedule of Expected Benefit Payments) (Details) - USD ($) $ in Thousands | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
--- | --- | --- | ---
Compensation And Retirement Disclosure [Abstract] |  |  |
2020 | $ 519 |  |
2021 | 512 |  |
2022 | 503 |  |
2023 | 494 |  |
2024 | 485 |  |
Thereafter | 4,046 |  |
Net amount recognized | $ 6,559 | $ 6,404 | $ 6,825

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