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Benefit Plans
 9 Months Ended
May 31, 2025
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, 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)
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, 2025, and we do not anticipate being required to make contributions to our pension plans in fiscal 2025, although we may voluntarily elect to do so.