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Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2022
experience study      
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Actuarial (gain) loss $ 0 $ 0  
Other demographic experience      
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Actuarial (gain) loss 1,465 (553)  
Other Benefits      
Component of net periodic benefit costs: [Abstract]      
Service costs 650 670 $ 996
Expected return on assets 0 0 0
Amortization of actuarial (gain) loss (1,616) (1,615) (1,259)
Periodic benefit costs, net $ (267) $ (355) $ (205)
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 5.33% 4.64% 2.57%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Discount rate 5.01% 5.33% 4.64%
Amortization of prior service (credit) costs $ (445) $ (445) $ (445)
Other Benefits | interest cost      
Component of net periodic benefit costs: [Abstract]      
Periodic benefit costs, net 1,144 1,035 503
Qualified Pension Benefits | experience study      
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Actuarial (gain) loss 2,988 2,573  
Qualified Pension Benefits | Other demographic experience      
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Actuarial (gain) loss 18,647 5,181  
Qualified Pension Benefits | Pension Benefits      
Component of net periodic benefit costs: [Abstract]      
Service costs 37,391 38,579 46,275
Amortization of actuarial (gain) loss 1,796 1,872 23,406
Periodic benefit costs, net $ 27,433 $ 28,059 $ 43,064
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 5.38% 4.69% 2.80%
Expected return on plan assets 5.64% 4.88% 4.88%
Rate of compensation increase 4.98% 4.93% 4.79%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Discount rate 5.09% 5.38% 4.69%
Rate of compensation increase 4.98% 4.98% 4.93%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate 4.68% 4.80% 4.65%
Amortization of prior service (credit) costs $ 178 $ 149 $ 174
Qualified Pension Benefits | Pension Benefits | interest cost      
Component of net periodic benefit costs: [Abstract]      
Periodic benefit costs, net 35,928 30,588 17,167
Qualified Pension Benefits | Pension Benefits | expected return on asset      
Component of net periodic benefit costs: [Abstract]      
Periodic benefit costs, net (47,860) (43,129) (43,958)
Nonqualified Pension Benefits | experience study      
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Actuarial (gain) loss 244 159  
Nonqualified Pension Benefits | Other demographic experience      
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Actuarial (gain) loss 3,217 1,999  
Nonqualified Pension Benefits | Pension Benefits      
Component of net periodic benefit costs: [Abstract]      
Service costs 1,968 1,840 926
Expected return on assets 0 0 0
Amortization of actuarial (gain) loss 380 245 478
Periodic benefit costs, net $ 3,277 $ 2,712 $ 1,571
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 5.22% 4.48% 2.04%
Rate of compensation increase 4.98% 4.93% 4.79%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract]      
Discount rate 4.78% 5.23% 4.49%
Rate of compensation increase 4.98% 4.98% 4.93%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate 4.68% 4.80% 4.65%
Amortization of prior service (credit) costs $ (114) $ (114) $ (114)
Nonqualified Pension Benefits | Pension Benefits | interest cost      
Component of net periodic benefit costs: [Abstract]      
Periodic benefit costs, net $ 1,043 $ 741 $ 281