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Benefit Plans | 9 Months Ended
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May 31, 2023
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, 2023 and 2022, are as follows:
| Three Months Ended May 31,
| Qualified Pension Benefits |  | Nonqualified Pension Benefits |  | Other Benefits
| 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
Components of net periodic benefit costs: | (Dollars in thousands)
Service cost | $ | 9,645 |  |  | $ | 11,569 |  |  | $ | 460 |  |  | $ | 232 |  |  | $ | 168 |  |  | $ | 249 |
Interest cost | 7,647 |  |  | 4,292 |  |  | 185 |  |  | 70 |  |  | 259 |  |  | 126 |
Expected return on assets | (10,782) |  |  | (10,990) |  |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 37 |  |  | 44 |  |  | (29) |  |  | (29) |  |  | (111) |  |  | (111) |
Actuarial loss (gain) amortization | 468 |  |  | 5,852 |  |  | 61 |  |  | 120 |  |  | (404) |  |  | (315) |
Net periodic benefit cost (benefit) | $ | 7,015 |  |  | $ | 10,767 |  |  | $ | 677 |  |  | $ | 393 |  |  | $ | (88) |  |  | $ | (51) |
| Nine Months Ended May 31,
| Qualified Pension Benefits |  | Nonqualified Pension Benefits |  | Other Benefits
| 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
Components of net periodic benefit costs: | (Dollars in thousands)
Service cost | $ | 28,934 |  |  | $ | 34,706 |  |  | $ | 1,380 |  |  | $ | 695 |  |  | $ | 503 |  |  | $ | 747 |
Interest cost | 22,941 |  |  | 12,875 |  |  | 556 |  |  | 211 |  |  | 776 |  |  | 377 |
Expected return on assets | (32,347) |  |  | (32,969) |  |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 112 |  |  | 131 |  |  | (86) |  |  | (86) |  |  | (334) |  |  | (334) |
Actuarial loss (gain) amortization | 1,404 |  |  | 17,555 |  |  | 184 |  |  | 359 |  |  | (1,211) |  |  | (944) |
Net periodic benefit cost (benefit) | $ | 21,044 |  |  | $ | 32,298 |  |  | $ | 2,034 |  |  | $ | 1,179 |  |  | $ | (266) |  |  | $ | (154) |
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, 2023, and we do not anticipate being required to make contributions for our pension plans in fiscal 2023, although we may voluntarily elect to do so.

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI https://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI https://asc.fasb.org/topic&trid=2197446 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI https://asc.fasb.org/topic&trid=2127225 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI https://asc.fasb.org/topic&trid=2235017 + Details
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