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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, 2023
Aug. 31, 2022
Aug. 31, 2021
Change in plan assets: [Abstract]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 40,000    
Fair value of plan assets at end of period 736,150    
Pension Benefits      
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 787,422    
Fair value of plan assets at end of period   $ 787,422  
Other Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 24,524 29,069  
Service cost 670 996 $ 1,186
Assumption change (1,312) (4,979)  
Plan Amendments 0 0  
Settlements 0 0  
Benefits paid (1,792) (1,801)  
Projected benefit obligation at end of period 22,572 24,524 29,069
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 1,792 1,801  
Benefits Paid (1,792) (1,801)  
Fair value of plan assets at end of period 0 0 0
Funded Status of Plan (22,572) (24,524)  
ASSETS      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (2,170) (2,290)  
Non-current liabilities (20,402) (22,234)  
Ending balance (22,572) (24,524)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (1,380) (1,825)  
Net (gain) loss (18,096) (17,846)  
Ending balance (19,476) (19,671)  
Qualified Pension Benefits | Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 759,173 925,239  
Service cost 38,579 46,275 45,229
Assumption change (45,216) (164,543)  
Plan Amendments 490 132  
Settlements 0 0  
Benefits paid (82,857) (77,913)  
Projected benefit obligation at end of period 708,511 759,173 925,239
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 787,422 993,124  
Actual gain (loss) on plan assets (8,415) (166,789)  
Defined Benefit Plan, Plan Assets, Contributions by Employer 40,000 39,000  
Benefits Paid (82,857) (77,913)  
Fair value of plan assets at end of period 736,150 787,422 993,124
Funded Status of Plan 27,639 28,249  
ASSETS      
Non-current assets 27,639 28,249  
Liabilities [Abstract]      
Current liabilities 0 0  
Non-current liabilities 0 0  
Ending balance 27,639 28,249  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) 1,172 831  
Net (gain) loss 247,609 235,399  
Ending balance 248,781 236,230  
Nonqualified Pension Benefits | Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 18,257 20,604  
Service cost 1,840 926 433
Assumption change (876) (2,892)  
Plan Amendments 0 0  
Settlements 0 (1,327)  
Benefits paid (1,140) (691)  
Projected benefit obligation at end of period 20,980 18,257 20,604
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 1,140 2,018  
Benefits Paid (1,140) (2,018)  
Fair value of plan assets at end of period 0 0 $ 0
Funded Status of Plan (20,980) (18,257)  
ASSETS      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (2,880) (2,300)  
Non-current liabilities (18,100) (15,957)  
Ending balance (20,980) (18,257)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (160) (274)  
Net (gain) loss 4,294 3,257  
Ending balance $ 4,134 $ 2,983