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Benefit Plans - Expected Future Retiree Benefit Payments (Details)
$ in Thousands
Aug. 31, 2022
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 $ 69,300
2024 70,500
2025 70,200
2026 71,500
2027 73,800
2028-2032 340,400
Non-Qualified Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 2,300
2024 2,420
2025 2,520
2026 2,300
2027 2,080
2028-2032 7,660
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 2,290
2024 2,270
2025 2,380
2026 2,310
2027 2,170
2028-2032 $ 8,660
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%