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Pension and Other Postretirement Benefit Plans | 3 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Pension and Other Postretirement Benefit Plans | Pension and Other Postretirement Benefit Plans The Company provides defined benefit pension and other postretirement plans to certain employees. Net periodic pension and other postretirement benefit cost for the plans included the following:
| Three months ended December 31,
| Pension |  | Other Postretirement
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 2,000 |  |  | $ | 2,039 |  |  | $ | 61 |  |  | $ | 84 |
Interest cost * | 2,301 |  |  | 2,049 |  |  | 180 |  |  | 158 |
Expected return on plan assets * | (2,596 | ) |  | (2,534 | ) |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |  |  |  |  |
Prior service cost | (46 | ) |  | (35 | ) |  | (49 | ) |  | (49 | )
Net actuarial loss (gain) * | 1,061 |  |  | 1,752 |  |  | (15 | ) |  | — |
Net benefit cost | $ | 2,720 |  |  | $ | 3,271 |  |  | $ | 177 |  |  | $ | 193 |
* Non-service components of pension and postretirement expense are included in other income (deductions), net. Benefit payments under the Company's principal retirement plan are made from plan assets, while benefit payments under the postretirement benefit plan are made from the Company's operating funds. Under IRS regulations, the Company is not required to make any significant contributions to its principal retirement plan in fiscal year 2019. Contributions made and anticipated for fiscal year 2019 are as follows:
Contributions |  | Pension |  | Other Postretirement
Contributions during the three months ended December 31, 2018: |  |  |  |
Supplemental retirement plan |  | $ | 196 |  |  | $ | — |
Other postretirement plan |  | — |  |  | 498 |
Additional contributions expected in fiscal 2019: |  |  |  |  |  |
Supplemental retirement plan |  | $ | 661 |  |  | $ | — |
Other postretirement plan |  | — |  |  | 577 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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