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FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 276,583 | $ 31,703
Accumulated gross unrealized gain, before tax | 77 | 10
Accumulated gross unrealized loss, before tax | (61) | (464)
Debt securities, available-for-sale | 69,899 | 120,559
Cash, cash equivalents and debt securities available-for-sale, amortized cost | 346,466 | 152,716
Cash, cash equivalents and debt securities available-for-sale | 346,482 | 152,262
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 276,583 | 31,703
Cash and cash equivalents, fair value disclosure | 276,583 | 31,703
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Costs | 69,883 | 121,013
Accumulated gross unrealized gain, before tax | 77 | 10
Accumulated gross unrealized loss, before tax | (61) | (464)
Debt securities, available-for-sale | 69,899 | 120,559
Commercial paper | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Costs |  | 13,254
Accumulated gross unrealized gain, before tax |  | 0
Accumulated gross unrealized loss, before tax |  | (8)
Debt securities, available-for-sale |  | 13,246
Corporate debt | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Costs | 46,516 | 70,631
Accumulated gross unrealized gain, before tax | 51 | 6
Accumulated gross unrealized loss, before tax | (29) | (296)
Debt securities, available-for-sale | 46,538 | 70,341
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 | 3,385
Accumulated gross unrealized gain, before tax | 9 | 3
Accumulated gross unrealized loss, before tax | (17) | (1)
Debt securities, available-for-sale | 13,588 | 3,387
Mortgage backed securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Costs |  | 27,063
Accumulated gross unrealized gain, before tax |  | 1
Accumulated gross unrealized loss, before tax |  | (119)
Debt securities, available-for-sale |  | 26,945
Agency bond | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Costs | 4,260 | 4,183
Accumulated gross unrealized gain, before tax | 0 | 0
Accumulated gross unrealized loss, before tax | (15) | (35)
Debt securities, available-for-sale | 4,245 | 4,148
Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 25,364 | 16,499
Cash and cash equivalents, fair value disclosure | 25,364 | 16,499
Money market funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 251,219 | 15,204
Cash and cash equivalents, fair value disclosure | $ 251,219 | $ 15,204

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