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Benefit Plans Schedule of Net Benefit Costs (Tables)
 9 Months Ended
May 31, 2025
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, 2025 and 2024, are as follows:
Three Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202520242025202420252024
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$10,932 $9,348 $757 $492 $211 $163 
Interest cost8,725 8,982 289 261 285 286 
Expected return on assets(11,744)(11,965)— — — — 
Prior service cost (credit) amortization50 45 (12)(29)(111)(111)
Actuarial loss (gain) amortization3,204 449 200 95 (309)(404)
Net periodic benefit cost (benefit)$11,167 $6,859 $1,234 $819 $76 $(66)
Nine Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202520242025202420252024
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$32,795 $28,044 $2,270 $1,476 $633 $488 
Interest cost26,174 26,946 866 783 855 858 
Expected return on assets(35,232)(35,895)— — — — 
Prior service cost (credit) amortization149 134 (35)(86)(334)(334)
Actuarial loss (gain) amortization9,611 1,347 599 285 (926)(1,212)
Net periodic benefit cost (benefit)$33,497 $20,576 $3,700 $2,458 $228 $(200)