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Benefit Plans - Information for the Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Thousands | Aug. 31, 2021 | Aug. 31, 2020
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Retirement Benefits [Abstract] |  |
Projected benefit obligation | $ 20,604 | $ 19,183
Accumulated benefit obligation | $ 20,513 | $ 18,172

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