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Fair Value Measurements - Financial Assets and Liabilities, Classified by Level (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | ---
Assets: |  |
Trading investments for deferred compensation plan | $ 24,056 | $ 20,085
Liabilities: |  |
Contingent consideration for business acquisition included in accrued and other current liabilities | 537 | 23,284
Fair Value, Measurements, Recurring | Level 1 |  |
Assets: |  |
Cash equivalents | 465,838 | 564,952
Trading investments for deferred compensation plan | 24,056 | 20,085
Liabilities: |  |
Contingent consideration for business acquisition included in accrued and other current liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts |  |
Assets: |  |
Currency exchange derivative assets included in other current assets | 0 | 0
Liabilities: |  |
Currency exchange derivative liabilities included in accrued and other current liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Cash |  |
Assets: |  |
Trading investments for deferred compensation plan | 75 | 846
Fair Value, Measurements, Recurring | Level 1 | Common stock |  |
Assets: |  |
Trading investments for deferred compensation plan | 1,544 | 0
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Assets: |  |
Trading investments for deferred compensation plan | 7,147 | 7,147
Fair Value, Measurements, Recurring | Level 1 | Mutual funds |  |
Assets: |  |
Trading investments for deferred compensation plan | 15,290 | 12,092
Fair Value, Measurements, Recurring | Level 2 |  |
Assets: |  |
Cash equivalents | 0 | 0
Trading investments for deferred compensation plan | 0 | 0
Liabilities: |  |
Contingent consideration for business acquisition included in accrued and other current liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts |  |
Assets: |  |
Currency exchange derivative assets included in other current assets | 0 | 129
Liabilities: |  |
Currency exchange derivative liabilities included in accrued and other current liabilities | 4,523 | 719
Fair Value, Measurements, Recurring | Level 2 | Cash |  |
Assets: |  |
Trading investments for deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Common stock |  |
Assets: |  |
Trading investments for deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Money market funds |  |
Assets: |  |
Trading investments for deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Mutual funds |  |
Assets: |  |
Trading investments for deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 3 |  |
Assets: |  |
Cash equivalents | 0 | 0
Trading investments for deferred compensation plan | 0 | 0
Liabilities: |  |
Contingent consideration for business acquisition included in accrued and other current liabilities | 0 | 23,284
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts |  |
Assets: |  |
Currency exchange derivative assets included in other current assets | 0 | 0
Liabilities: |  |
Currency exchange derivative liabilities included in accrued and other current liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Cash |  |
Assets: |  |
Trading investments for deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Common stock |  |
Assets: |  |
Trading investments for deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Money market funds |  |
Assets: |  |
Trading investments for deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Mutual funds |  |
Assets: |  |
Trading investments for deferred compensation plan | $ 0 | $ 0

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