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Benefit Plans
 9 Months Ended
May 31, 2026
Retirement Benefits [Abstract]  
Benefit plans Benefit Plans
    We have various pension and other defined benefit and defined contribution plans, in which substantially all employees may participate. We also have nonqualified supplemental executive and Board of Directors retirement plans.
    Components of net periodic benefit costs for the three and nine months ended May 31, 2026 and 2025, are as follows:
Three Months Ended May 31,
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 
Nine Months Ended May 31,
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202620252026202520262025
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$34,043 $32,795 $2,494 $2,270 $630 $633 
Interest cost27,080 26,174 1,005 866 844 855 
Expected return on assets(37,737)(35,232)— — — — 
Prior service (credit) cost amortization(446)149 (23)(35)(334)(334)
Actuarial loss (gain) amortization12,374 9,611 737 599 (898)(926)
Net periodic benefit cost $35,314 $33,497 $4,213 $3,700 $242 $228 

Employer Contributions

    Contributions depend primarily on market returns on the pension plan assets and minimum funding level requirements. No contributions were made to the pension plans during the nine months ended May 31, 2026, and we do not anticipate being required to make contributions to our pension plans in fiscal 2026, although we may voluntarily elect to do so.