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Employee Benefit Plans (Plan Asset Details) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | --- | ---
Defined benefit plans |  |  |
Fair value of plan assets | $ 98,010 | $ 90,365 | $ 84,718
Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 87,707 | 89,155 |
Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 10,303 | 1,210 |
Cash and cash equivalents |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 14,213 | 10,737 |
Cash and cash equivalents | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 14,213 | 10,737 |
Cash and cash equivalents | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Equity securities |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 28,329 | 27,559 |
Equity securities | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 28,329 | 27,559 |
Equity securities | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Debt securities |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 26,605 | 26,823 |
Debt securities | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 26,605 | 26,823 |
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 | 24,644 | 21,659 |
Swiss real estate funds | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 16,476 | 21,659 |
Swiss real estate funds | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 8,168 | 0 |
Hedge funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 1,882 | 912 |
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 | 1,882 | 912 |
Other |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 2,337 | 2,675 |
Other | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 2,084 | 2,377 |
Other | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | $ 253 | $ 298 |

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