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Benefit Plans - Expected Future Retiree Benefit Payments (Details) $ in Thousands | Aug. 31, 2018 USD ($)
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Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2019 | $ 66,528
2020 | 62,320
2021 | 61,279
2022 | 62,877
2023 | 64,573
2024-2028 | 328,313
Non-Qualified Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2019 | 1,780
2020 | 1,670
2021 | 1,750
2022 | 2,230
2023 | 1,840
2024-2028 | 9,270
Other Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2019 | 2,040
2020 | 2,260
2021 | 2,400
2022 | 2,590
2023 | 2,720
2024-2028 | $ 12,690
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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