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Employee Benefit Plans - Plan Assets Allocations (Details) | Sep. 30, 2019 | Sep. 30, 2018
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Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, actual | 100.00% | 100.00%
Equity Securities [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, actual | 9.00% | 9.00%
Equity Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, minimum | 5.00% |
Equity Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, minimum | 45.00% |
Fixed Income Securities [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, actual | 88.00% | 88.00%
Fixed Income Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, minimum | 55.00% |
Fixed Income Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, minimum | 95.00% |
Other [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, actual | 3.00% | 3.00%
Other [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, minimum | 0.00% |
Other [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets Allocation [Abstract] |  |
Asset target allocation, minimum | 5.00% |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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=118257860&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 (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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