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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) - Pension Benefits - USD ($) $ in Thousands | Aug. 31, 2021 | Aug. 31, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | $ 993,124 | $ 976,542
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 11,383 | 57,801
Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 180,766 | 219,050
Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 707,831 | 603,250
Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 93,144 | 94,400
Other assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 2,041
Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Fair Value, Inputs, Level 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Fair Value, Inputs, Level 3 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 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 | 0
Fair Value, Inputs, Level 3 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Fair Value, Inputs, Level 3 | Other assets |  |
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 | 11,383 | 57,801
Fair Value, Inputs, Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 11,383 | 57,801
Fair Value, Inputs, Level 1 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 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 | 0
Fair Value, Inputs, Level 1 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Fair Value, Inputs, Level 1 | Other assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Fair Value, Inputs, Level 2 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Fair Value, Inputs, Level 2 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 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 | 0
Fair Value, Inputs, Level 2 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | $ 0 | 0
Fair Value, Inputs, Level 2 | Other assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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