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Fair Value Measurements (Tables) | 6 Months Ended
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Sep. 30, 2018
Financial Instruments, Owned, at Fair Value [Abstract] |
Schedule of financial assets and liabilities accounted for at fair value and classified by level within the fair value hierarchy | The following table presents the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis, excluding assets related to the Company’s defined benefit pension plans, classified by the level within the fair value hierarchy (in thousands):
|  | September 30, 2018 |  | March 31, 2018
|  | Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 304,627 |  |  | $ | — |  |  | $ | — |  |  | $ | 492,535 |  |  | $ | — |  |  | $ | — |
Trading investments for deferred compensation plan included in other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 4,252 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,881 |  |  | $ | — |  |  | $ | — |
Mutual funds |  | 16,393 |  |  | — |  |  | — |  |  | 14,867 |  |  | — |  |  | — |
Total of trading investments for deferred compensation plan |  | $ | 20,645 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,748 |  |  | $ | — |  |  | $ | — |
Currency exchange derivative assets included in other current assets |  | $ | — |  |  | $ | 244 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Currency exchange derivative liabilities included in accrued and other current liabilities |  | $ | — |  |  | $ | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 34 |  |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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