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CONVERTIBLE SENIOR NOTES AND CAPPED CALL (Tables) | 6 Months Ended
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Sep. 30, 2019
Debt Disclosure [Abstract] |
Convertible Debt | The net carrying amount of the liability component of the Notes was as follows (in thousands):
|  | September 30, 2019 |  | March 31, 2019
Principal |  | $ | 287,500 |  |  | $ | 287,500 |
Unamortized debt discount |  | (64,532 | ) |  | (70,876 | )
Unamortized issuance costs |  | (536 | ) |  | (589 | )
Net carrying amount |  | $ | 222,432 |  |  | $ | 216,035 |
Interest Income and Interest Expense Disclosure | Interest expense related to the Notes was as follows (in thousands):
|  | Three Months Ended September 30, 2019 |  | Six Months Ended September 30, 2019
Contractual interest expense |  | $ | 360 |  |  | $ | 719 |
Amortization of debt discount |  | 3,198 |  |  | $ | 6,344 |
Amortization of issuance costs |  | 27 |  |  | $ | 53 |
Total interest expense |  | $ | 3,585 |  |  | $ | 7,116 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
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