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Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 42,000    
Defined benefit plan, health care benefits annual rate of increase in the per capita cost 8.70%    
Defined benefit plan, health care benefits, decrease in the per capita cost trend rate 4.50%    
Defined contribution plan, contributions by employer $ 43,500 $ 38,700 $ 35,000
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 727,900 678,400  
Defined benefit plan, expected future benefit payments, next twelve months 69,800    
Non-Qualified Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 26,200 20,900  
Defined benefit plan, expected future benefit payments, next twelve months 3,950    
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer 1,725 $ 1,792  
Defined benefit plan, expected future benefit payments, next twelve months 2,080    
Pension Plans And Postretirement Plans, Defined Benefit, Non-Qualified [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, expected future benefit payments, next twelve months $ 6,000    
Maximum | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, target allocation percentage 55.00%    
Maximum | Fixed Income Investments      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, target allocation percentage 80.00%    
Minimum | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, target allocation percentage 20.00%    
Minimum | Fixed Income Investments      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, target allocation percentage 45.00%