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Postretirement and Other Employee Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 538,273 | $ 158,101 | $ 151,715
Asset Allocation (as a percent) | 100.00% | 100.00% |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 14,900 | $ 7,705 |
Asset Allocation (as a percent) | 3.00% | 5.00% |
Global equity securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 208,384 | $ 20,215 |
Asset Allocation (as a percent) | 38.00% | 13.00% |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 237,812 | $ 42,522 |
Asset Allocation (as a percent) | 44.00% | 27.00% |
Government bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 58,095 | $ 69,880 |
Asset Allocation (as a percent) | 11.00% | 44.00% |
Insurance contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 19,082 | $ 17,779 |
Asset Allocation (as a percent) | 4.00% | 11.00% |

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