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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
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%

X

- 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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