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BUSINESS COMBINATION - Narrative (Details) - USD ($) shares in Thousands, $ in Millions |  | 6 Months Ended
--- | --- | ---
Jul. 17, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |
Stock awards granted (in shares) |  | 5,123 | 2,112
Wavecell Pte. Ltd. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  | $ 1.6 |
Business combination, consideration transferred | $ 117.1 |  |
Payments to acquire business | 72.8 |  |
Business combination, value of stock issued | 44.3 |  |
Cash held back to cover indemnity claims | 10.4 |  |
Equity held back to cover indemnity claims | $ 8.5 |  |
Wavecell Pte. Ltd. | Time-Based Restricted Stock Awards |  |  |
Business Acquisition [Line Items] |  |  |
Stock awards granted (in shares) | 13,200 |  |
Wavecell Pte. Ltd. | Performance-Based Restricted Stock Awards |  |  |
Business Acquisition [Line Items] |  |  |
Stock awards granted (in shares) | 6,600 |  |
Vesting period | 3 years |  |
Restricted Cash, Current And Other Accrued Liabilities | Wavecell Pte. Ltd. |  |  |
Business Acquisition [Line Items] |  |  |
Cash held back to cover indemnity claims | $ 3.5 |  |
Restricted Cash, Noncurrent And Other Liabilities, Noncurrent | Wavecell Pte. Ltd. |  |  |
Business Acquisition [Line Items] |  |  |
Cash held back to cover indemnity claims | $ 6.9 |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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