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FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 162,219 | $ 276,583
Accumulated gross unrealized gain, before tax | 149 | 77
Accumulated gross unrealized loss, before tax | (8) | (61)
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 211,850 | 346,466
Cash, cash equivalents and debt securities available-for-sale | 211,991 | 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 |  | 276,583
Accumulated gross unrealized gain, before tax | 7 |
Accumulated gross unrealized loss, before tax | (5) |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 164,802 |
Cash, cash equivalents and debt securities available-for-sale | 164,804 |
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 47,048 | 69,883
Accumulated gross unrealized gain, before tax | 142 | 77
Accumulated gross unrealized loss, before tax | (3) | (61)
Debt securities, available-for-sale | 47,187 | 69,899
Treasury securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 6,578 |
Accumulated gross unrealized gain, before tax | 7 |
Accumulated gross unrealized loss, before tax | (5) |
Debt securities, available-for-sale | 6,580 |
Corporate bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 37,858 | 46,516
Accumulated gross unrealized gain, before tax | 123 | 51
Accumulated gross unrealized loss, before tax | (3) | (29)
Debt securities, available-for-sale | 37,978 | 46,538
Commercial paper | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 5,592 |
Accumulated gross unrealized gain, before tax | 0 |
Accumulated gross unrealized loss, before tax | 0 |
Debt securities, available-for-sale | 5,592 |
Municipal securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 2,099 | 5,511
Accumulated gross unrealized gain, before tax | 19 | 17
Accumulated gross unrealized loss, before tax | 0 | 0
Debt securities, available-for-sale | 2,118 | 5,528
Asset backed securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost |  | 13,596
Accumulated gross unrealized gain, before tax |  | 9
Accumulated gross unrealized loss, before tax |  | (17)
Debt securities, available-for-sale |  | 13,588
Agency bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 1,499 | 4,260
Accumulated gross unrealized gain, before tax | 0 | 0
Accumulated gross unrealized loss, before tax | 0 | (15)
Debt securities, available-for-sale | 1,499 | 4,245
Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 25,673 | 25,364
Cash and cash equivalents, fair value | 25,673 | 25,364
Money market funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 132,551 | 251,219
Cash and cash equivalents, fair value | 132,551 | 251,219
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 | 162,219 |
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 | 158,224 |
Cash and Cash Equivalents | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 3,995 |
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 | 3,995 |
Cash and Cash Equivalents | Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents |  | 25,364
Cash and cash equivalents, fair value | 25,673 |
Cash and Cash Equivalents | Money market funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents |  | 251,219
Cash and cash equivalents, fair value | 132,551 |
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 | 29,324 |
Short-term Investments | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 29,324 | 69,899
Short-term Investments | Corporate bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 24,110 | 46,538
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 | 1,597 |
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 | 2,118 | 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 bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 1,499 | $ 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 | 20,448 |
Long-term Investments | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 6,580 |
Long-term Investments | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 13,868 |
Long-term Investments | Treasury securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 6,580 |
Long-term Investments | Corporate bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 13,868 |
Long-term Investments | Commercial paper | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 0 |
Long-term Investments | Municipal securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 0 |
Long-term Investments | Agency bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | $ 0 |

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