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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Pension |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | $ 2,138 | $ 1,813 | $ 6,414 | $ 5,439
Interest cost | 1,841 | 2,406 | 5,523 | 7,218
Expected return on plan assets | (2,312) | (2,407) | (6,936) | (7,221)
Amortization: |  |  |  |
Prior service cost | (45) | (46) | (135) | (138)
Net actuarial loss | 2,509 | 1,866 | 7,527 | 5,598
Net benefit cost | 4,131 | 3,632 | 12,393 | 10,896
Defined Benefit Plan, Expected Future Employer Contributions [Abstract] |  |  |  |
Supplemental retirement plan |  |  | 5,110 |
Other postretirement plan |  |  | 0 |
Additional contributions expected in fiscal 2017: | 0 |  | 0 |
Supplemental retirement plan |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions [Abstract] |  |  |  |
Supplemental retirement plan |  |  | 543 |
Other postretirement plan |  |  | 0 |
Additional contributions expected in fiscal 2017: | 217 |  | 217 |
Other postretirement plan |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | 98 | 101 | 294 | 303
Interest cost | 157 | 211 | 471 | 633
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 | 206 | $ 263 | 618 | $ 789
Defined Benefit Plan, Expected Future Employer Contributions [Abstract] |  |  |  |
Supplemental retirement plan |  |  | 0 |
Other postretirement plan |  |  | 552 |
Additional contributions expected in fiscal 2017: | $ 596 |  | $ 596 |

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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 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 other postretirement benefits. Excludes pension 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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- 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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