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Benefit Plans
 9 Months Ended
May 31, 2024
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, 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)

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, 2024, and we do not anticipate being required to make contributions to our pension plans in fiscal 2024, although we may voluntarily elect to do so.