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Convertible Senior Notes (Tables) | 9 Months Ended
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Oct. 31, 2018
Debt Disclosure [Abstract] |
Convertible debt schedules | The net carrying amount of the liability component of the Notes was as follows (in thousands):
| October 31, 2018
Principal | $ | 300,000 |
Unamortized debt discount | (80,197 | )
Unamortized debt issuance costs | (6,111 | )
Net carrying amount | $ | 213,692 |
The net carrying amount of the equity component of the Notes was as follows (in thousands):
| October 31, 2018
Debt discount for conversion option | $ | 84,168 |
Issuance costs | (2,485 | )
Net carrying amount | $ | 81,683 |
Interest expense related to Notes | The following table sets forth the interest expense related to the Notes (in thousands):
| Three Months Ended October 31, |  | Nine Months Ended October 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Contractual interest expense | $ | 563 |  |  | $ | — |  |  | $ | 763 |  |  | $ | — |
Amortization of debt discount | 2,938 |  |  | — |  |  | 3,971 |  |  | — |
Amortization of issuance costs | 174 |  |  | — |  |  | 234 |  |  | — |
Total | $ | 3,675 |  |  | $ | — |  |  | $ | 4,968 |  |  | $ | — |

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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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