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Employee Retirement Plans (Category of Plan Assets) (Details) | 12 Months Ended
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Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Total | 100.00%
Percentage of Plan Assets | 100.00%
Domestic large cap equities |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocation | 36.00%
Percentage of Plan Assets | 41.00%
Domestic small/mid cap equities |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocation | 9.00%
Percentage of Plan Assets | 7.00%
International equities |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocation | 15.00%
Percentage of Plan Assets | 16.00%
Balanced/asset allocation |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocation | 4.00%
Percentage of Plan Assets | 2.00%
Fixed income and cash |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocation | 36.00%
Percentage of Plan Assets | 34.00%

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