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Interim Pension and Other Postretirement Benefits (Table) | 6 Months Ended
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Mar. 31, 2018
Retirement Benefits, Description [Abstract] |
Components of net periodic pension cost table | The components of our net periodic pension cost for our pension and other postretirement benefit plans for the three and six months ended March 31, 2018 and 2017 are presented in the following tables. Most of these costs are recoverable through our tariff rates; however, a portion of these costs is capitalized into our rate base. The remaining costs are recorded as a component of operation and maintenance expense. In the second quarter of fiscal 2018, due to the retirement of certain executives, we recognized a settlement loss of $2.4 million associated with our Supplemental Executive Retirement Plan and revalued the net periodic pension cost for the remainder of fiscal 2018. The revaluation of the net periodic pension cost for our Supplemental Executive Retirement Plan resulted in an increase in the discount rate, effective March 1, 2018, to 4.12%, which will increase our net periodic pension cost by approximately $0.1 million for the remainder of the fiscal year.
| Three Months Ended March 31
| Pension Benefits |  | Other Benefits
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
Components of net periodic pension cost: |  |  |  |  |  |  |
Service cost | $ | 4,575 |  |  | $ | 5,217 |  |  | $ | 3,019 |  |  | $ | 3,109 |
Interest cost | 6,433 |  |  | 6,297 |  |  | 2,727 |  |  | 2,670 |
Expected return on assets | (6,916 | ) |  | (6,994 | ) |  | (2,001 | ) |  | (1,797 | )
Amortization of prior service cost (credit) | (58 | ) |  | (58 | ) |  | 3 |  |  | (411 | )
Amortization of actuarial (gain) loss | 3,085 |  |  | 4,249 |  |  | (1,619 | ) |  | (707 | )
Settlements | 2,415 |  |  | — |  |  | — |  |  | — |
Net periodic pension cost | $ | 9,534 |  |  | $ | 8,711 |  |  | $ | 2,129 |  |  | $ | 2,864 |
| Six Months Ended March 31
| Pension Benefits |  | Other Benefits
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
Components of net periodic pension cost: |  |  |  |  |  |  |
Service cost | $ | 9,135 |  |  | $ | 10,433 |  |  | $ | 6,039 |  |  | $ | 6,218 |
Interest cost | 12,863 |  |  | 12,594 |  |  | 5,454 |  |  | 5,340 |
Expected return on assets | (13,833 | ) |  | (13,988 | ) |  | (4,003 | ) |  | (3,593 | )
Amortization of prior service cost (credit) | (116 | ) |  | (116 | ) |  | 6 |  |  | (822 | )
Amortization of actuarial (gain) loss | 6,174 |  |  | 8,498 |  |  | (3,237 | ) |  | (1,414 | )
Settlements | 2,415 |  |  | — |  |  | — |  |  | — |
Net periodic pension cost | $ | 16,638 |  |  | $ | 17,421 |  |  | $ | 4,259 |  |  | $ | 5,729 |
Schedule of assumptions used table text block | The assumptions used to develop our net periodic pension cost for the three and six months ended March 31, 2018 and 2017 are as follows:
|  | Supplemental Executive Retirement Plan |  | Pension Benefits |  | Other Benefits
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Discount rate |  | 4.12% |  | 3.73% |  | 3.89% |  | 3.73% |  | 3.89% |  | 3.73%
Rate of compensation increase |  | 3.50% |  | 3.50% |  | 3.50% |  | 3.50% |  | N/A |  | N/A
Expected return on plan assets |  | N/A |  | N/A |  | 6.75% |  | 7.00% |  | 4.29% |  | 4.45%

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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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