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Pension and Other Postretirement Benefit Plans (Tables) | 3 Months Ended
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Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Net Periodic Pension and Other Postretirement Benefit Cost | Net periodic pension and other postretirement benefit cost for the plans included the following:
| Three months ended December 31,
| Pension |  | Other Postretirement
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 2,138 |  |  | $ | 1,813 |  |  | $ | 98 |  |  | $ | 101 |
Interest cost | 1,841 |  |  | 2,406 |  |  | 157 |  |  | 211 |
Expected return on plan assets | (2,312 | ) |  | (2,407 | ) |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |  |  |  |  |
Prior service cost | (45 | ) |  | (46 | ) |  | (49 | ) |  | (49 | )
Net actuarial loss | 2,509 |  |  | 1,866 |  |  | — |  |  | — |
Net benefit cost | $ | 4,131 |  |  | $ | 3,632 |  |  | $ | 206 |  |  | $ | 263 |
Contributions Made and Anticipated for the Current Fiscal Year | Contributions made and anticipated for fiscal year 2017 are as follows:
Contributions |  | Pension |  | Other Postretirement
Contributions during the three months ended December 31, 2016: |  |  |  |
Supplemental retirement plan |  | $ | 181 |  |  | $ | — |
Other postretirement plan |  | — |  |  | 207 |
Additional contributions expected in fiscal 2017: |  |  |  |  |  |
Principal retirement plan |  | $ | 5,109 |  |  | $ | — |
Supplemental retirement plan |  | 579 |  |  | — |
Other postretirement plan |  | — |  |  | 941 |

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- Definition Tabular disclosure of contributions made and anticipated for the current fiscal year, for pension and other postretirement plans. + References No definition available. + 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=58740216&loc=d3e1928-114920 + Details
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