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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 | Jun. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | $ 470,773 | $ 464,448
Short-Term Investments | 33,099 | 32,807
Other Current Assets | 12,808 | 12,110
Total assets | 516,680 | 509,365
Cash |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | 28,113 | 22,603
Short-Term Investments | 0 | 0
Other Current Assets | 0 | 0
Total assets | 28,113 | 22,603
Level 1 | Money market funds |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | 442,660 | 439,853
Short-Term Investments | 0 | 0
Other Current Assets | 0 | 0
Total assets | 442,660 | 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 | 12,808 | 12,110
Total assets | 12,808 | 12,110
Level 1 | U.S. Treasury securities |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents | 0 |
Short-Term Investments | 25,599 |
Other Current Assets | 0 |
Total assets | 25,599 |
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
Level 2 | U.S. Treasury securities |  |
Fair value of assets and liabilities |  |
Cash and Cash Equivalents |  | 1,992
Short-Term Investments |  | 25,307
Other Current Assets |  | 0
Total assets |  | $ 27,299

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