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FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | $ 137,394 | $ 276,583 | $ 31,703
Accumulated gross unrealized gain, before tax | 154 | 77 |
Accumulated gross unrealized loss, before tax | (341) | (61) |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 187,122 | 346,466 |
Cash, cash equivalents and debt securities available-for-sale | 186,935 | 346,482 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents |  | 276,583 |
Cash and cash equivalents, fair value disclosure |  | 276,583 |
Accumulated gross unrealized gain, before tax | 116 |  |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 137,990 |  |
Cash, cash equivalents and debt securities available-for-sale | 138,106 |  |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs | 49,132 | 69,883 |
Accumulated gross unrealized gain, before tax | 38 | 77 |
Accumulated gross unrealized loss, before tax | (341) | (61) |
Debt securities, available-for-sale | 48,829 | 69,899 |
Treasuries | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs | 6,192 |  |
Accumulated gross unrealized gain, before tax | 116 |  |
Debt securities, available-for-sale | 6,308 |  |
Commercial paper | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs | 14,979 |  |
Accumulated gross unrealized gain, before tax | 6 |  |
Accumulated gross unrealized loss, before tax | 0 |  |
Debt securities, available-for-sale | 14,985 |  |
Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs | 34,153 | 46,516 |
Accumulated gross unrealized gain, before tax | 32 | 51 |
Accumulated gross unrealized loss, before tax | (341) | (29) |
Debt securities, available-for-sale | 33,844 | 46,538 |
Municipal securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs |  | 5,511 |
Accumulated gross unrealized gain, before tax |  | 17 |
Accumulated gross unrealized loss, before tax |  | 0 |
Debt securities, available-for-sale |  | 5,528 |
Asset backed securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs |  | 13,596 |
Accumulated gross unrealized gain, before tax |  | 9 |
Accumulated gross unrealized loss, before tax |  | (17) |
Debt securities, available-for-sale |  | 13,588 |
Agency bond | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized Costs |  | 4,260 |
Accumulated gross unrealized gain, before tax |  | 0 |
Accumulated gross unrealized loss, before tax |  | (15) |
Debt securities, available-for-sale |  | 4,245 |
Cash and Cash Equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents |  | 276,583 |
Cash, cash equivalents and debt securities available-for-sale | 137,394 |  |
Cash and Cash Equivalents | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents |  | 276,583 |
Cash, cash equivalents and debt securities available-for-sale | 131,798 |  |
Cash and Cash Equivalents | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 5,596 |  |
Cash and Cash Equivalents | Commercial paper | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 5,596 |  |
Short-Term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale |  | 69,899 |
Cash, cash equivalents and debt securities available-for-sale | 33,458 |  |
Short-Term Investments | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 33,458 | 69,899 |
Short-Term Investments | Commercial paper | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 9,389 |  |
Short-Term Investments | Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 24,069 | 46,538 |
Short-Term Investments | Municipal securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale |  | 5,528 |
Short-Term Investments | Asset backed securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale |  | 13,588 |
Short-Term Investments | Agency bond | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale |  | 4,245 |
Long-Term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash, cash equivalents and debt securities available-for-sale | 16,083 |  |
Long-Term Investments | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 6,308 |  |
Long-Term Investments | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 9,775 |  |
Long-Term Investments | Treasuries | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 6,308 |  |
Long-Term Investments | Corporate debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, available-for-sale | 9,775 |  |
Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 21,002 | 25,364 |
Cash and cash equivalents, fair value disclosure | 21,002 | 25,364 |
Cash | Cash and Cash Equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 21,002 | 25,364 |
Money market funds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 110,796 | 251,219 |
Cash and cash equivalents, fair value disclosure | 110,796 | 251,219 |
Money market funds | Cash and Cash Equivalents | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | $ 110,796 | $ 251,219 |

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