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Benefit Plans - Expected Future Retiree Benefit Payments (Details) $ in Thousands | Aug. 31, 2017 USD ($)
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Qualified Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2018 | $ 64,044
2019 | 61,510
2020 | 59,997
2021 | 61,753
2022 | 62,869
2023-2027 | 325,797
Non-Qualified Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2018 | 2,270
2019 | 2,170
2020 | 1,960
2021 | 1,950
2022 | 2,440
2023-2027 | 11,960
Other Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2018 | 2,140
2019 | 2,240
2020 | 2,510
2021 | 2,530
2022 | 2,670
2023-2027 | $ 12,750
Fixed Income Securities | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage | 35.00%
Fixed Income Securities | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage | 55.00%
Equity Securities | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage | 45.00%
Equity Securities | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target allocation percentage | 65.00%

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