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Benefit Plans - Expected Future Retiree Benefit Payments (Details) $ in Thousands | Aug. 31, 2020 USD ($)
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Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | $ 75,700
2022 | 65,900
2023 | 63,500
2024 | 64,700
2025 | 65,300
2026-2030 | 326,700
Non-Qualified Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 1,660
2022 | 1,840
2023 | 1,840
2024 | 1,620
2025 | 1,820
2026-2030 | 8,010
Other Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 2,090
2022 | 2,280
2023 | 2,470
2024 | 2,450
2025 | 2,450
2026-2030 | $ 9,790
Fixed Income Securities | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage | 45.00%
Fixed Income Securities | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage | 65.00%
Equity Securities | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage | 35.00%
Equity Securities | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage | 55.00%

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