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Employee Retirement Plans (Category of Plan Assets) (Details)	Mar. 31, 2018	Mar. 31, 2017
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

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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

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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

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