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Defined Benefit Pension and Other Postretirement Plans - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Contribution made to pension and post-retirement plans |  |  | $ 6,300,000 | $ 5,000,000.0
Expected contribution to pension plan during remainder of fiscal year |  | $ 6,000,000.0 |  | 6,000,000.0
Other Postretirement Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Contribution made to pension and post-retirement plans |  |  | 0 | 0
Defined benefit plan, net periodic benefit cost (credit) | $ (100,000) | (100,000) | (100,000) | (200,000)
Unfunded Plan | Nonqualified Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Defined benefit plan, net periodic benefit cost (credit) | $ 0 | $ 0 | $ 0 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 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=118257860&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 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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