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Employee Benefit Plans - Plan Assets Allocations (Details)	Sep. 30, 2019	Sep. 30, 2018
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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- References

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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

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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

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