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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Pension |  |
Net periodic benefit cost [Abstract] |  |
Service cost | $ 2,000 | $ 2,039
Interest cost | 2,301 | 2,049
Expected return on plan assets | (2,596) | (2,534)
Amortization: |  |
Prior service cost | (46) | (35)
Net actuarial loss (gain) | 1,061 | 1,752
Net benefit cost | 2,720 | 3,271
Other Postretirement |  |
Net periodic benefit cost [Abstract] |  |
Service cost | 61 | 84
Interest cost | 180 | 158
Expected return on plan assets | 0 | 0
Amortization: |  |
Prior service cost | (49) | (49)
Net actuarial loss (gain) | (15) | 0
Net benefit cost | 177 | $ 193
Contributions during the three months ended December 31, 2018: |  |
Other Postretirement | 498 |
Additional contributions expected in fiscal 2019: |  |
Supplemental retirement plan | 577 |
Supplemental retirement plan |  |
Contributions during the three months ended December 31, 2018: |  |
Pension | 196 |
Additional contributions expected in fiscal 2019: |  |
Supplemental retirement plan | $ 661 |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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