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Retirement and Other Benefit Plans - Schedule Of Asset Allocation For Pension Plans Acceptable Range And Target Allocation By Asset Category (Details) | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018
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Cash and cash equivalents |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 3.00% | 2.00%
Cash and cash equivalents | Maximum |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 10.00% |  |
Cash and cash equivalents | Minimum |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |
Cash and cash equivalents | Target Allocation 2020 |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |
Return seeking |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 41.00% | 44.00%
Return seeking | Maximum |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 58.00% |  |
Return seeking | Minimum |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 48.00% |  |
Return seeking | Target Allocation 2020 |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 53.00% |  |
Hedge Funds, Equity |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 56.00% | 54.00%
Hedge Funds, Equity | Maximum |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 52.00% |  |
Hedge Funds, Equity | Minimum |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 42.00% |  |
Hedge Funds, Equity | Target Allocation 2020 |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 47.00% |  |

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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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