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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) - Pension Benefits - USD ($) $ in Thousands | Aug. 31, 2019 | Aug. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | $ 909,427 | $ 829,616
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 7,938 | 7,424
Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 692
Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 209,860 | 216,962
Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 574,296 | 500,637
Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 101,641 | 101,954
Other assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 15,692 | 1,947
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 7,938 | 8,116
Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 7,938 | 7,424
Level 1 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 692
Level 1 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 1 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 1 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 1 | Other assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 2 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 2 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Level 2 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 2 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 2 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 2 | Other assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 3 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 3 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value |  | 0
Level 3 | Equity Securities: Common/collective trust [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 3 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 3 | Partnership and joint venture interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | 0 | 0
Level 3 | Other assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plans assets, fair value | $ 0 | $ 0

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