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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) - USD ($) $ in Thousands | Aug. 31, 2023 | Aug. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | $ 736,150 |
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 12,505 |
Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 127,225 |
Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 425,180 |
Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 59,782 |
Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 111,458 |
Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 3 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 3 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 3 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 3 | Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 37,648 | $ 7,472
Fair Value, Inputs, Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 12,505 |
Fair Value, Inputs, Level 1 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 1 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 1 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 1 | Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 25,143 |
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 86,315 |
Fair Value, Inputs, Level 2 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 2 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 2 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 2 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 |
Fair Value, Inputs, Level 2 | Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | $ 86,315 |
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 787,422
Pension Benefits | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 7,472
Pension Benefits | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 142,730
Pension Benefits | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 550,046
Pension Benefits | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 87,174
Pension Benefits | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 3 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 3 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 3 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 7,472
Pension Benefits | Fair Value, Inputs, Level 1 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 1 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 1 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 2 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 2 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 2 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Pension Benefits | Fair Value, Inputs, Level 2 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | $ 0

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