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Benefit Plans Schedule of Net Benefit Costs (Tables) | 9 Months Ended
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May 31, 2025
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs of Assumptions Used | 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
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Components of net periodic benefit costs: | (Dollars in thousands)
Service cost | $ | 10,932 |  |  | $ | 9,348 |  |  | $ | 757 |  |  | $ | 492 |  |  | $ | 211 |  |  | $ | 163 |
Interest cost | 8,725 |  |  | 8,982 |  |  | 289 |  |  | 261 |  |  | 285 |  |  | 286 |
Expected return on assets | (11,744) |  |  | (11,965) |  |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 50 |  |  | 45 |  |  | (12) |  |  | (29) |  |  | (111) |  |  | (111) |
Actuarial loss (gain) amortization | 3,204 |  |  | 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
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Components of net periodic benefit costs: | (Dollars in thousands)
Service cost | $ | 32,795 |  |  | $ | 28,044 |  |  | $ | 2,270 |  |  | $ | 1,476 |  |  | $ | 633 |  |  | $ | 488 |
Interest cost | 26,174 |  |  | 26,946 |  |  | 866 |  |  | 783 |  |  | 855 |  |  | 858 |
Expected return on assets | (35,232) |  |  | (35,895) |  |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 149 |  |  | 134 |  |  | (35) |  |  | (86) |  |  | (334) |  |  | (334) |
Actuarial loss (gain) amortization | 9,611 |  |  | 1,347 |  |  | 599 |  |  | 285 |  |  | (926) |  |  | (1,212) |
Net periodic benefit cost (benefit) | $ | 33,497 |  |  | $ | 20,576 |  |  | $ | 3,700 |  |  | $ | 2,458 |  |  | $ | 228 |  |  | $ | (200) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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