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Benefit Plans - Expected Future Retiree Benefit Payments (Details) $ in Thousands | Aug. 31, 2019 USD ($)
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Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2020 | $ 72,600
2021 | 64,900
2022 | 61,900
2023 | 63,900
2024 | 65,000
2025-2029 | 326,100
Non-Qualified Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2020 | 1,580
2021 | 1,370
2022 | 1,940
2023 | 1,950
2024 | 2,030
2025-2029 | 8,840
Other Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2020 | 2,040
2021 | 2,180
2022 | 2,410
2023 | 2,540
2024 | 2,520
2025-2029 | $ 11,110
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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