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Benefit Plans Schedule of Net Benefit Costs (Tables) | 3 Months Ended
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Nov. 30, 2019
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs of Assumptions Used |
| Three Months Ended November 30,
| Qualified Pension Benefits |  | Nonqualified Pension Benefits |  | Other Benefits
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Components of net periodic benefit costs: | (Dollars in thousands)
Service cost | $ | 10,538 |  |  | $ | 9,648 |  |  | $ | 101 |  |  | $ | 78 |  |  | $ | 262 |  |  | $ | 263 |
Interest cost | 5,431 |  |  | 7,099 |  |  | 107 |  |  | 187 |  |  | 187 |  |  | 274 |
Expected return on assets | (11,671 | ) |  | (11,242 | ) |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 45 |  |  | 42 |  |  | (28 | ) |  | (19 | ) |  | (111 | ) |  | (139 | )
Actuarial loss (gain) amortization | 5,396 |  |  | 3,087 |  |  | 25 |  |  | — |  |  | (348 | ) |  | (407 | )
Net periodic benefit cost | $ | 9,739 |  |  | $ | 8,634 |  |  | $ | 205 |  |  | $ | 246 |  |  | $ | (10 | ) |  | $ | (9 | )

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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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