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Benefit Plans - Expected Future Retiree Benefit Payments (Details)
$ in Thousands
Aug. 31, 2017
USD ($)
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%