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Postretirement and Other Employee Benefits (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands | Aug. 31, 2019 | Aug. 31, 2018
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Retirement Benefits [Abstract] |  |
Projected benefit obligation | $ 174,690 | $ 161,104
Accumulated benefit obligation | 161,729 | 152,380
Fair value of plan assets | $ 158,101 | $ 151,715

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