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Benefit Plans
6 Months Ended
Feb. 29, 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 six months ended February 29, 2024, and February 28, 2023, are as follows:
Three Months Ended
Qualified
Pension Benefits
Nonqualified
Pension Benefits
Other Benefits
 February 29,
2024
February 28,
2023
February 29,
2024
February 28,
2023
February 29,
2024
February 28,
2023
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)
Six Months Ended
Qualified
Pension Benefits
Nonqualified
Pension Benefits
Other Benefits
 February 29,
2024
February 28,
2023
February 29,
2024
February 28,
2023
February 29,
2024
February 28,
2023
Components of net periodic benefit costs: (Dollars in thousands)
Service cost$18,696 $19,290 $984 $920 $325 $335 
Interest cost17,964 15,294 522 371 572 518 
Expected return on assets(23,930)(21,565)— — — — 
Prior service cost (credit) amortization89 75 (57)(57)(223)(223)
Actuarial loss (gain) amortization898 936 190 123 (808)(808)
Net periodic benefit cost (benefit)$13,717 $14,030 $1,639 $1,357 $(134)$(178)

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 six months ended February 29, 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.