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Fair Value Measurements - Financial Assets and Liabilities, Classified by Level (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Assets: |  |
Trading investments for deferred compensation plan | $ 20,645 | $ 17,748
Fair Value, Measurements, Recurring | Level 1 |  |
Assets: |  |
Cash equivalents | 304,627 | 492,535
Trading investments for deferred compensation plan | 20,645 | 17,748
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 | Money market funds |  |
Assets: |  |
Trading investments for deferred compensation plan | 4,252 | 2,881
Fair Value, Measurements, Recurring | Level 1 | Mutual funds |  |
Assets: |  |
Trading investments for deferred compensation plan | 16,393 | 14,867
Fair Value, Measurements, Recurring | Level 2 |  |
Assets: |  |
Cash equivalents | 0 | 0
Trading investments for deferred compensation plan | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts |  |
Assets: |  |
Currency exchange derivative assets included in other current assets | 244 | 0
Liabilities: |  |
Currency exchange derivative liabilities included in accrued and other current liabilities | 50 | 34
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
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 | 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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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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