v3.25.1
Benefit Plans Schedule of Net Benefit Costs (Tables)
 6 Months Ended
Feb. 28, 2025
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs of Assumptions Used Components of net periodic benefit costs for the three and six months ended February 28, 2025, and February 29, 2024, are as follows:
Three Months Ended
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 February 28, 2025February 29, 2024February 28, 2025February 29, 2024February 28, 2025February 29, 2024
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)
Six Months Ended
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 February 28, 2025February 29, 2024February 28, 2025February 29, 2024February 28, 2025February 29, 2024
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$21,864 $18,696 $1,514 $984 $422 $325 
Interest cost17,449 17,964 577 522 570 572 
Expected return on assets(23,488)(23,930)— — — — 
Prior service cost (credit) amortization100 89 (24)(57)(223)(223)
Actuarial loss (gain) amortization6,408 898 400 190 (617)(808)
Net periodic benefit cost (benefit)$22,333 $13,717 $2,467 $1,639 $152 $(134)