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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pension |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | $ 2,039 | $ 2,138 | $ 6,117 | $ 6,414
Interest cost | 2,049 | 1,841 | 6,147 | 5,523
Expected return on plan assets | (2,534) | (2,312) | (7,602) | (6,936)
Amortization: |  |  |  |
Prior service cost | (35) | (45) | (105) | (135)
Net actuarial loss | 1,753 | 2,509 | 5,257 | 7,527
Net benefit cost | 3,272 | 4,131 | 9,814 | 12,393
Defined Benefit Plan, Expected Future Employer Contributions [Abstract] |  |  |  |
Pension |  |  | 10,000 |
Other Postretirement |  |  | 0 |
Other Postretirement |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | 84 | 98 | 252 | 294
Interest cost | 158 | 157 | 474 | 471
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Prior service cost | (49) | (49) | (147) | (147)
Net actuarial loss | 0 | 0 | 0 | 0
Net benefit cost | 193 | $ 206 | 579 | $ 618
Defined Benefit Plan, Expected Future Employer Contributions [Abstract] |  |  |  |
Other Postretirement |  |  | 1,281 |
Supplemental retirement plan |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions [Abstract] |  |  |  |
Pension |  |  | 575 |
Additional contributions expected in fiscal 2018: | $ 191 |  | $ 191 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + 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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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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