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Benefit Plans - Expected Future Retiree Benefit Payments (Details)
$ in Thousands
Aug. 31, 2021
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 $ 70,100
2023 70,900
2024 70,300
2025 71,400
2026 73,900
2027-2031 342,700
Non-Qualified Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 2,220
2023 2,490
2024 2,210
2025 2,110
2026 2,100
2027-2031 7,930
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 1,970
2023 2,260
2024 2,340
2025 2,340
2026 2,290
2027-2031 $ 8,920
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 80.00%
Equity Securities | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, target allocation percentage 20.00%
Equity Securities | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, target allocation percentage 55.00%