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Employee Retirement Plans (Category of Plan Assets) (Details) | Mar. 31, 2018 | Mar. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 100.00% |
Percentage of Plan Assets | 100.00% | 100.00%
Domestic large cap equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 21.00% |
Percentage of Plan Assets | 21.00% | 41.00%
Domestic small/mid cap equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 6.00% |
Percentage of Plan Assets | 6.00% | 7.00%
International equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 18.00% |
Percentage of Plan Assets | 18.00% | 16.00%
Balanced/asset allocation |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 0.00% |
Percentage of Plan Assets | 0.00% | 2.00%
Fixed income and cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 55.00% |
Percentage of Plan Assets | 55.00% | 34.00%

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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