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Benefit Plans Schedule of Net Benefit Costs (Tables) | 6 Months Ended
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Feb. 28, 2021
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs of Assumptions Used | Components of net periodic benefit costs for the three and six months ended February 28, 2021, and February 29, 2020, are as follows:
| Three Months Ended
| Qualified Pension Benefits |  | Nonqualified Pension Benefits |  | Other Benefits
| February 28, 2021 |  | February 29, 2020 |  | February 28, 2021 |  | February 29, 2020 |  | February 28, 2021 |  | February 29, 2020
Components of net periodic benefit costs: | (Dollars in thousands)
Service cost | $ | 11,307 |  |  | $ | 10,538 |  |  | $ | 108 |  |  | $ | 101 |  |  | $ | 297 |  |  | $ | 262 |
Interest cost | 4,141 |  |  | 5,431 |  |  | 68 |  |  | 107 |  |  | 123 |  |  | 187 |
Expected return on assets | (10,910) |  |  | (11,671) |  |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 45 |  |  | 45 |  |  | (28) |  |  | (28) |  |  | (111) |  |  | (111) |
Actuarial loss (gain) amortization | 5,447 |  |  | 5,396 |  |  | 53 |  |  | 25 |  |  | (341) |  |  | (348) |
Net periodic benefit cost (benefit) | $ | 10,030 |  |  | $ | 9,739 |  |  | $ | 201 |  |  | $ | 205 |  |  | $ | (32) |  |  | $ | (10) |
| Six Months Ended
| Qualified Pension Benefits |  | Nonqualified Pension Benefits |  | Other Benefits
| February 28, 2021 |  | February 29, 2020 |  | February 28, 2021 |  | February 29, 2020 |  | February 28, 2021 |  | February 29, 2020
Components of net periodic benefit costs: | (Dollars in thousands)
Service cost | $ | 22,614 |  |  | $ | 21,076 |  |  | $ | 217 |  |  | $ | 203 |  |  | $ | 593 |  |  | $ | 525 |
Interest cost | 8,281 |  |  | 10,861 |  |  | 136 |  |  | 214 |  |  | 246 |  |  | 374 |
Expected return on assets | (21,821) |  |  | (23,342) |  |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 89 |  |  | 89 |  |  | (57) |  |  | (57) |  |  | (223) |  |  | (223) |
Actuarial loss (gain) amortization | 10,895 |  |  | 10,791 |  |  | 106 |  |  | 49 |  |  | (682) |  |  | (696) |
Net periodic benefit cost (benefit) | $ | 20,058 |  |  | $ | 19,475 |  |  | $ | 402 |  |  | $ | 409 |  |  | $ | (66) |  |  | $ | (20) |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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