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Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 30,000    
Defined benefit plan, health care benefits annual rate of increase in the per capita cost 8.50%    
Defined benefit plan, health care benefits, decrease in the per capita cost trend rate 4.50%    
Defined contribution plan, contributions by employer $ 47,100 $ 43,500 $ 38,700
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 748,100 727,900  
Defined benefit plan, expected future benefit payments, next twelve months 74,200    
Non-Qualified Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 31,300 26,200  
Defined benefit plan, expected future benefit payments, next twelve months 4,890    
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer 1,624 $ 1,725  
Defined benefit plan, expected future benefit payments, next twelve months 1,630    
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 $ 6,500    
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%