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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, 2021
Aug. 31, 2020
Aug. 31, 2019
Change in plan assets: [Abstract]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 23,200    
Pension Benefits      
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 976,542    
Fair value of plan assets at end of period 993,124 $ 976,542  
Other Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 30,316 31,098  
Service cost 1,186 1,050 $ 1,053
Interest cost 493 747 1,094
Actuarial (gain) loss (765) (2,286)  
Assumption change (398) 1,275  
Plan Amendments 0 0  
Settlements 0 0  
Benefits paid (1,763) (1,568)  
Projected benefit obligation at end of period 29,069 30,316 31,098
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 1,763 1,568  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Benefits Paid (1,763) (1,568)  
Fair value of plan assets at end of period 0 0 0
Funded Status of Plan (29,069) (30,316)  
ASSETS      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (1,970) (2,090)  
Non-current liabilities (27,099) (28,226)  
Ending balance (29,069) (30,316)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (2,270) (2,715)  
Net (gain) loss (14,862) (15,064)  
Ending balance (17,132) (17,779)  
Qualified Pension Benefits | Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 918,002 876,696  
Service cost 45,229 42,151 38,592
Interest cost 16,563 21,722 28,396
Actuarial (gain) loss 34,958 6,265  
Assumption change (12,847) 40,694  
Plan Amendments 113 0  
Settlements 0 0  
Benefits paid (76,779) (69,526)  
Projected benefit obligation at end of period 925,239 918,002 876,696
Change in plan assets: [Abstract]      
Fair value of plan assets at beginning of period 976,542 909,427  
Actual gain (loss) on plan assets 70,161 90,241  
Defined Benefit Plan, Plan Assets, Contributions by Employer 23,200 46,400  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Benefits Paid (76,779) (69,526)  
Fair value of plan assets at end of period 993,124 976,542 909,427
Funded Status of Plan 67,885 58,540  
ASSETS      
Non-current assets 67,885 58,540  
Liabilities [Abstract]      
Current liabilities 0 0  
Non-current liabilities 0 0  
Ending balance 67,885 58,540  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) 873 938  
Net (gain) loss 199,785 225,983  
Ending balance 200,658 226,921  
Nonqualified Pension Benefits | Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 19,183 19,047  
Service cost 433 405 311
Interest cost 273 429 747
Actuarial (gain) loss 2,034 1,382  
Assumption change (55) 775  
Plan Amendments 0 0  
Settlements 0 (2,130)  
Benefits paid (1,264) (725)  
Projected benefit obligation at end of period 20,604 19,183 19,047
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 1,264 2,855  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 (2,130)  
Benefits Paid (1,264) (725)  
Fair value of plan assets at end of period 0 0 $ 0
Funded Status of Plan (20,604) (19,183)  
ASSETS      
Non-current assets 0 0  
Liabilities [Abstract]      
Current liabilities (2,220) (1,660)  
Non-current liabilities (18,384) (17,523)  
Ending balance (20,604) (19,183)  
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract]      
Prior service cost (credit) (388) (502)  
Net (gain) loss 5,579 3,813  
Ending balance $ 5,191 $ 3,311