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Employee Retirement Plans - Pension Plans Assets (Details) - Pension Benefits - U.S. | Sep. 30, 2020 | Sep. 30, 2019
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Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 100.00% | 100.00%
Target Asset Allocation | 100.00% | 100.00%
Total domestic equity investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 26.50% | 54.80%
Target Asset Allocation | 29.00% | 52.50%
Total domestic equity investments | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 24.00% |
Total domestic equity investments | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 34.00% |
International index equity mutual funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 25.00% | 11.80%
Target Asset Allocation | 24.50% | 12.50%
International index equity mutual funds | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 19.50% |
International index equity mutual funds | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 29.50% |
Global equity index investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 12.30% | 0.00%
Target Asset Allocation | 11.50% | 0.00%
Global equity index investments | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 6.50% |
Global equity index investments | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 16.50% |
Equity investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 63.80% | 66.60%
Target Asset Allocation | 65.00% | 65.00%
Equity investments | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 60.00% |
Equity investments | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 70.00% |
Fixed income funds & cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 36.20% | 33.40%
Target Asset Allocation | 35.00% | 35.00%
Fixed income funds & cash equivalents | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 30.00% |
Fixed income funds & cash equivalents | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 40.00% |

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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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