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Benefit Plans Schedule of Net Benefit Costs (Tables) | 6 Months Ended
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Feb. 28, 2018
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs of Assumptions Used |
| Qualified Pension Benefits |  | Non-Qualified Pension Benefits |  | Other Benefits
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Components of net periodic benefit costs for the three months ended February 28 are as follows: | (Dollars in thousands)
Service cost | $ | 9,920 |  |  | $ | 11,692 |  |  | $ | 137 |  |  | $ | 344 |  |  | $ | 236 |  |  | $ | 227 |
Interest cost | 5,991 |  |  | 3,812 |  |  | 178 |  |  | 70 |  |  | 227 |  |  | 39 |
Expected return on assets | (12,049 | ) |  | (12,101 | ) |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 360 |  |  | 368 |  |  | 7 |  |  | (47 | ) |  | (142 | ) |  | (253 | )
Actuarial (gain) loss amortization | 4,511 |  |  | 6,650 |  |  | 16 |  |  | 100 |  |  | (306 | ) |  | (283 | )
Net periodic benefit cost | $ | 8,733 |  |  | $ | 10,421 |  |  | $ | 338 |  |  | $ | 467 |  |  | $ | 15 |  |  | $ | (270 | )
Components of net periodic benefit costs for the six months ended February 28 are as follows: |
Service cost | $ | 19,839 |  |  | $ | 21,075 |  |  | $ | 274 |  |  | $ | 603 |  |  | $ | 472 |  |  | $ | 580 |
Interest cost | 11,992 |  |  | 11,504 |  |  | 356 |  |  | 422 |  |  | 454 |  |  | 466 |
Expected return on assets | (24,089 | ) |  | (24,115 | ) |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) amortization | 719 |  |  | 770 |  |  | 15 |  |  | 10 |  |  | (283 | ) |  | (283 | )
Actuarial (gain) loss amortization | 11,399 |  |  | 11,415 |  |  | 30 |  |  | 273 |  |  | (612 | ) |  | (399 | )
Net periodic benefit cost | $ | 19,860 |  |  | $ | 20,649 |  |  | $ | 675 |  |  | $ | 1,308 |  |  | $ | 31 |  |  | $ | 364 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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