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Employee Benefit Plans (Plan Asset Details) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | ---
Defined benefit plans |  |  |
Fair value of plan assets | $ 84,718 | $ 71,376 | $ 65,279
Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 84,404 | 67,575 |
Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 314 | 3,801 |
Cash and cash equivalents |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 18,355 | 11,910 |
Cash and cash equivalents | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 18,331 | 11,864 |
Cash and cash equivalents | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 24 | 46 |
Equity securities |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 26,204 | 20,985 |
Equity securities | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 26,204 | 20,985 |
Equity securities | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Debt securities |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 25,150 | 22,373 |
Debt securities | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 25,150 | 22,373 |
Debt securities | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Swiss real estate funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 12,096 | 9,699 |
Swiss real estate funds | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 12,096 | 9,699 |
Swiss real estate funds | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Hedge funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 3,507 |
Hedge funds | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Hedge funds | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 3,507 |
Insurance contracts |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 32 | 61 |
Insurance contracts | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Insurance contracts | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 32 | 61 |
Other |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 2,881 | 2,841 |
Other | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 2,623 | 2,654 |
Other | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | $ 258 | $ 187 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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