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Benefit Plans Schedule of Net Benefit Costs (Tables)
 9 Months Ended
May 31, 2024
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, 2024 and 2023, are as follows:
Three Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202420232024202320242023
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$9,348 $9,645 $492 $460 $163 $168 
Interest cost8,982 7,647 261 185 286 259 
Expected return on assets(11,965)(10,782)— — — — 
Prior service cost (credit) amortization45 37 (29)(29)(111)(111)
Actuarial loss (gain) amortization449 468 95 61 (404)(404)
Net periodic benefit cost (benefit)$6,859 $7,015 $819 $677 $(66)$(88)
Nine Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202420232024202320242023
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$28,044 $28,934 $1,476 $1,380 $488 $503 
Interest cost26,946 22,941 783 556 858 776 
Expected return on assets(35,895)(32,347)— — — — 
Prior service cost (credit) amortization134 112 (86)(86)(334)(334)
Actuarial loss (gain) amortization1,347 1,404 285 184 (1,212)(1,211)
Net periodic benefit cost (benefit)$20,576 $21,044 $2,458 $2,034 $(200)$(266)