v3.26.1
Benefit Plans (Tables)
 6 Months Ended
Feb. 28, 2026
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Costs Components of net periodic benefit costs for the three months ended February 28, 2026 and 2025, are as follows:
Three Months Ended February 28,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202620252026202520262025
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$11,348 $10,932 $831 $757 $210 $211 
Interest cost9,027 8,725 335 289 281 285 
Expected return on assets(12,579)(11,744)— — — — 
Prior service (credit) cost amortization(149)50 (8)(12)(111)(111)
Actuarial loss (gain) amortization4,125 3,204 246 200 (299)(309)
Net periodic benefit cost$11,772 $11,167 $1,404 $1,234 $81 $76 
Six Months Ended February 28,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202620252026202520262025
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$22,695 $21,864 $1,663 $1,514 $420 $422 
Interest cost18,053 17,449 670 577 563 570 
Expected return on assets(25,158)(23,488)— — — — 
Prior service (credit) cost amortization(298)100 (15)(24)(223)(223)
Actuarial loss (gain) amortization8,249 6,408 491 400 (599)(617)
Net periodic benefit cost $23,541 $22,333 $2,809 $2,467 $161 $152