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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, 2024
Aug. 31, 2023
Aug. 31, 2022
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period $ 736,150    
Defined Benefit Plan, Plan Assets, Contributions by Employer 42,000    
Fair value of plan assets at end of period 781,412 $ 736,150  
Other Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 22,572 24,524  
Service cost 650 670 $ 996
Assumption change 681 (1,312)  
Plan Amendments 0 0  
Benefits paid (1,725) (1,792)  
Projected benefit obligation at end of period 24,787 22,572 24,524
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 1,725 1,792  
Benefits Paid (1,725) (1,792)  
Fair value of plan assets at end of period 0 0 0
Funded Status of Plan (24,787) (22,572)  
ASSETS      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (2,080) (2,170)  
Non-current liabilities (22,707) (20,402)  
Ending balance (24,787) (22,572)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (935) (1,380)  
Net (gain) loss (14,335) (18,096)  
Ending balance (15,270) (19,476)  
Qualified Pension Benefits | Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 708,511 759,173  
Service cost 37,391 38,579 46,275
Assumption change 21,372 (45,216)  
Plan Amendments 223 490  
Benefits paid (64,297) (82,857)  
Projected benefit obligation at end of period 760,763 708,511 759,173
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 736,150 787,422  
Actual gain (loss) on plan assets 67,559 (8,415)  
Defined Benefit Plan, Plan Assets, Contributions by Employer 42,000 40,000  
Benefits Paid (64,297) (82,857)  
Fair value of plan assets at end of period 781,412 736,150 787,422
Funded Status of Plan 20,649 27,639  
ASSETS      
Non-current assets 20,649 27,639  
Liabilities [Abstract]      
Current liabilities 0 0  
Non-current liabilities 0 0  
Ending balance 20,649 27,639  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) 1,216 1,172  
Net (gain) loss 269,122 247,609  
Ending balance 270,338 248,781  
Nonqualified Pension Benefits | Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 20,980 18,257  
Service cost 1,968 1,840 926
Assumption change 626 (876)  
Plan Amendments 0 0  
Benefits paid (1,635) (1,140)  
Projected benefit obligation at end of period 26,443 20,980 18,257
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 1,635 1,140  
Benefits Paid (1,635) (1,140)  
Fair value of plan assets at end of period 0 0 $ 0
Funded Status of Plan (26,443) (20,980)  
ASSETS      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (3,950) (2,880)  
Non-current liabilities (22,493) (18,100)  
Ending balance (26,443) (20,980)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (47) (160)  
Net (gain) loss 8,001 4,294  
Ending balance $ 7,954 $ 4,134