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Benefit Plans - Financial Information on Changes in Benefit Obligation, Plan Assets Funded and Balance Sheets Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2023
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period $ 781,412    
Defined Benefit Plan, Plan Assets, Contributions by Employer 30,000    
Fair value of plan assets at end of period 776,286 $ 781,412  
experience study      
Change in benefit obligation:      
Actuarial (gain) loss (29) 0  
Other Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 24,787 22,572  
Service cost 844 650 $ 670
Periodic benefit costs, net 347 (267) (355)
Assumption change (845) 681  
Plan Amendments 0 0  
Benefits paid (1,624) (1,725)  
Projected benefit obligation at end of period 23,627 24,787 22,572
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 0 0  
Actual gain (loss) on plan assets 0 0  
Defined Benefit Plan, Plan Assets, Contributions by Employer 1,624 1,725  
Benefits Paid (1,624) (1,725)  
Fair value of plan assets at end of period 0 0 0
Funded Status of Plan (23,627) (24,787)  
ASSETS      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (1,630) (2,080)  
Non-current liabilities (21,997) (22,707)  
Ending balance (23,627) (24,787)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (490) (935)  
Net (gain) loss (14,662) (14,335)  
Ending balance (15,152) (15,270)  
Other Benefits | interest cost      
Change in benefit obligation:      
Periodic benefit costs, net 1,140 1,144 1,035
Qualified Pension Benefits | experience study      
Change in benefit obligation:      
Actuarial (gain) loss 8,394 2,988  
Qualified Pension Benefits | Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 760,763 708,511  
Service cost 43,727 37,391 38,579
Periodic benefit costs, net 44,662 27,433 28,059
Assumption change (30,273) 21,372  
Plan Amendments (6,236) 223  
Benefits paid (57,776) (64,297)  
Projected benefit obligation at end of period 773,522 760,763 708,511
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 781,412 736,150  
Actual gain (loss) on plan assets 22,650 67,559  
Defined Benefit Plan, Plan Assets, Contributions by Employer 30,000 42,000  
Benefits Paid (57,776) (64,297)  
Fair value of plan assets at end of period 776,286 781,412 736,150
Funded Status of Plan 2,764 20,649  
ASSETS      
Non-current assets 11,969 20,649  
Liabilities [Abstract]      
Current liabilities 0 0  
Non-current liabilities (9,205) 0  
Ending balance 2,764 20,649  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (5,219) 1,216  
Net (gain) loss 278,779 269,122  
Ending balance 273,560 270,338  
Qualified Pension Benefits | Pension Benefits | interest cost      
Change in benefit obligation:      
Periodic benefit costs, net 34,898 35,928 30,588
Nonqualified Pension Benefits | experience study      
Change in benefit obligation:      
Actuarial (gain) loss 365 244  
Nonqualified Pension Benefits | Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 26,443 20,980  
Service cost 3,027 1,968 1,840
Periodic benefit costs, net 4,933 3,277 2,712
Assumption change (331) 626  
Plan Amendments (227) 0  
Benefits paid (1,829) (1,635)  
Projected benefit obligation at end of period 31,464 26,443 20,980
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 0 0  
Actual gain (loss) on plan assets 0 0  
Defined Benefit Plan, Plan Assets, Contributions by Employer 1,829 1,635  
Benefits Paid (1,829) (1,635)  
Fair value of plan assets at end of period 0 0 0
Funded Status of Plan (31,464) (26,443)  
ASSETS      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (4,890) (3,950)  
Non-current liabilities (26,574) (22,493)  
Ending balance (31,464) (26,443)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (227) (47)  
Net (gain) loss 10,097 8,001  
Ending balance 9,870 7,954  
Nonqualified Pension Benefits | Pension Benefits | interest cost      
Change in benefit obligation:      
Periodic benefit costs, net $ 1,154 $ 1,043 $ 741