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Benefit Plans Schedule of Net Benefit Costs (Tables)
 9 Months Ended
May 31, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs of Assumptions Used Components of net periodic benefit costs for the three and nine months ended May 31, 2021 and 2020, are as follows:
Three Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202120202021202020212020
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$11,307 $10,538 $108 $101 $297 $262 
Interest cost4,141 5,431 68 107 123 187 
Expected return on assets(10,910)(11,671)— — — — 
Prior service cost (credit) amortization45 45 (28)(28)(111)(111)
Actuarial loss (gain) amortization5,447 5,396 53 25 (341)(348)
Net periodic benefit cost (benefit)$10,030 $9,739 $201 $205 $(32)$(10)
Nine Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202120202021202020212020
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$33,921 $31,613 $325 $304 $890 $787 
Interest cost12,422 16,292 205 322 369 560 
Expected return on assets(32,731)(35,013)— — — — 
Prior service cost (credit) amortization134 134 (85)(85)(334)(334)
Actuarial loss (gain) amortization16,342 16,187 159 74 (1,024)(1,044)
Net periodic benefit cost (benefit)$30,088 $29,213 $604 $615 $(99)$(31)