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ACQUISITIONS - Narrative (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 17, 2019 | Oct. 29, 2018 | Apr. 12, 2018 | Mar. 31, 2020
Wavecell Pte. Ltd. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, consideration transferred | $ 117.1 |  |  |
Payments to acquire businesses, gross | 72.8 |  |  |
Business combination, consideration transferred, equity interests issued and issuable | $ 44.3 |  |  |
Vesting period | 3 years |  |  |
Business combination, acquisition related costs |  |  |  | $ 1.8
Unamortized stock-based compensation expense |  |  |  | $ 15.1
Weighted average period of recognition for unrecognized compensation expense |  |  |  | 2 years 3 months 18 days
Developed technology | MarianaIQ |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life (in Years) |  |  | 2 years |
Finite-lived intangible assets, remaining amortization period |  |  | 2 years |
Developed technology | Jitsi |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life (in Years) |  | 2 years |  |
Finite-lived intangible assets, remaining amortization period |  | 2 years |  |
Developed technology | Wavecell Pte. Ltd. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life (in Years) | 7 years |  |  |
Restricted Cash, Current And Other Accrued Liabilities | Wavecell Pte. Ltd. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, indemnification assets, cash held back | $ 10.4 |  |  |
Other Accrued Liabilities, Current | Wavecell Pte. Ltd. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, indemnification assets, equity held back | 8.5 |  |  |
Time-Based Restricted Stock Awards | Wavecell Pte. Ltd. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, consideration transferred, equity interests issued and issuable | 13.2 |  |  |
Performance-Based Restricted Stock Awards | Wavecell Pte. Ltd. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, consideration transferred, equity interests issued and issuable | $ 6.6 |  |  |

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