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FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 269,025 | $ 276,583
Accumulated gross unrealized gain, before tax | 147 | 77
Accumulated gross unrealized loss, before tax | (8) | (61)
Debt securities, available-for-sale | 49,153 |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 318,039 | 346,466
Cash, cash equivalents and debt securities available-for-sale | 318,178 | 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 | 2 |
Accumulated gross unrealized loss, before tax | 0 |
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 267,348 |
Cash, cash equivalents and debt securities available-for-sale | 267,350 |
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 50,691 | 69,883
Accumulated gross unrealized gain, before tax | 145 | 77
Accumulated gross unrealized loss, before tax | (8) | (61)
Debt securities, available-for-sale | 50,828 | 69,899
Treasury securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 2,910 |
Accumulated gross unrealized gain, before tax | 2 |
Accumulated gross unrealized loss, before tax | 0 |
Debt securities, available-for-sale | 2,912 |
Corporate bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 40,128 | 46,516
Accumulated gross unrealized gain, before tax | 122 | 51
Accumulated gross unrealized loss, before tax | (3) | (29)
Debt securities, available-for-sale | 40,247 | 46,538
Commercial paper | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 6,176 |
Accumulated gross unrealized gain, before tax | 0 |
Accumulated gross unrealized loss, before tax | (2) |
Debt securities, available-for-sale | 6,174 |
Commercial paper | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 2,098 | 5,511
Accumulated gross unrealized gain, before tax | 23 | 17
Accumulated gross unrealized loss, before tax | 0 | 0
Debt securities, available-for-sale | 2,121 | 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 bond | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized cost | 2,289 | 4,260
Accumulated gross unrealized gain, before tax | 0 | 0
Accumulated gross unrealized loss, before tax | (3) | (15)
Debt securities, available-for-sale | 2,286 | 4,245
Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 23,533 | 25,364
Cash and cash equivalents, fair value | 23,533 | 25,364
Money market funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 240,905 | 251,219
Cash and cash equivalents, fair value | 240,905 | 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 | 269,025 |
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 | 264,438 |
Cash and Cash Equivalents | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 4,587 |
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 | 4,587 |
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 | 23,533 |
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 | 240,905 |
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 | 27,486 |
Short-term Investments | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 27,486 | 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 | 23,613 | 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 | 1,587 |
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 | 0 | 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 | 2,286 | $ 4,245
Long-term Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash, cash equivalents and debt securities available-for-sale | 21,667 |
Long-term Debt | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 2,912 |
Long-term Debt | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 18,755 |
Long-term Debt | Treasury securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 2,912 |
Long-term Debt | Corporate bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 16,634 |
Long-term Debt | 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 Debt | Commercial paper | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available-for-sale | 2,121 |
Long-term Debt | Agency bond | 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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