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Benefit Plans Schedule of Net Benefit Costs (Tables)
 9 Months Ended
May 31, 2022
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, 2022 and 2021, are as follows:
Three Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202220212022202120222021
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$11,569 $11,307 $232 $108 $249 $297 
Interest cost4,292 4,141 70 68 126 123 
Expected return on assets(10,990)(10,910)— — — — 
Prior service cost (credit) amortization44 45 (29)(28)(111)(111)
Actuarial loss (gain) amortization5,852 5,447 120 53 (315)(341)
Net periodic benefit cost (benefit)$10,767 $10,030 $393 $201 $(51)$(32)
Nine Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202220212022202120222021
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$34,706 $33,921 $695 $325 $747 $890 
Interest cost12,875 12,422 211 205 377 369 
Expected return on assets(32,969)(32,731)— — — — 
Prior service cost (credit) amortization131 134 (86)(85)(334)(334)
Actuarial loss (gain) amortization17,555 16,342 359 159 (944)(1,024)
Net periodic benefit cost (benefit)$32,298 $30,088 $1,179 $604 $(154)$(99)