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FAIR VALUE OF FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value Measurements within the Fair Value Hierarchy (Details) - Fair value measurements on recurring basis - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | $ 492,169 | $ 464,448
Short-Term Investments | 31,920 | 32,807
Other Current Assets | 12,405 | 12,110
Total assets | 536,494 | 509,365
Cash |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | 25,200 | 22,603
Short-Term Investments | 0 | 0
Other Current Assets | 0 | 0
Total assets | 25,200 | 22,603
Level 1 | Money market funds |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | 466,969 | 439,853
Short-Term Investments | 0 | 0
Other Current Assets | 0 | 0
Total assets | 466,969 | 439,853
Level 1 | Assets of non-qualified retirement plan |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | 0 | 0
Short-Term Investments | 0 | 0
Other Current Assets | 12,405 | 12,110
Total assets | 12,405 | 12,110
Level 1 | U.S. Treasury securities |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | 0 | 1,992
Short-Term Investments | 24,420 | 25,307
Other Current Assets | 0 | 0
Total assets | 24,420 | 27,299
Level 1 | Certificates of deposit |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | 0 | 0
Short-Term Investments | 7,500 | 7,500
Other Current Assets | 0 | 0
Total assets | $ 7,500 | $ 7,500

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. + References No definition available. + Details
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