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Benefit Plans - Expected Future Retiree Benefit Payments (Details)
$ in Thousands
Aug. 31, 2018
USD ($)
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%