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Convertible Senior Notes, Net (Tables) | 3 Months Ended
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Apr. 30, 2018
Debt Disclosure [Abstract] |
Schedule of Senior Notes | The Notes, net consisted of the following (in thousands):
| April 30, 2018 |  | January 31, 2018
| 2018 Notes |  | 2020 Notes |  | 2022 Notes |  | 2018 Notes |  | 2020 Notes |  | 2022 Notes
Principal amounts: |  |  |  |  |  |  |  |  |  |  |
Principal | $ | 350,000 |  |  | $ | 250,000 |  |  | $ | 1,150,000 |  |  | $ | 350,000 |  |  | $ | 250,000 |  |  | $ | 1,150,000 |
Unamortized debt discount | (3,567 | ) |  | (24,407 | ) |  | (198,127 | ) |  | (7,850 | ) |  | (26,968 | ) |  | (208,188 | )
Unamortized debt issuance costs | (289 | ) |  | (1,486 | ) |  | (12,631 | ) |  | (641 | ) |  | (1,654 | ) |  | (13,345 | )
Net carrying amount | $ | 346,144 |  |  | $ | 224,107 |  |  | $ | 939,242 |  |  | $ | 341,509 |  |  | $ | 221,378 |  |  | $ | 928,467 |
Carrying amount of the equity component (1) | $ | 74,892 |  |  | $ | 66,007 |  |  | $ | 219,702 |  |  | $ | 74,892 |  |  | $ | 66,007 |  |  | $ | 219,702 |
(1) | Included on the condensed consolidated balance sheets within Additional paid-in capital, net of $2 million, $2 million, and $4 million for the 2018 Notes, 2020 Notes, and 2022 Notes, respectively, in equity issuance costs.
Schedule of Interest Expense Recognized Related to Convertible Senior Notes | The following table sets forth total interest expense recognized related to the Notes (in thousands):
| Three Months Ended April 30,
| 2018 |  | 2017
| 2018 Notes |  | 2020 Notes |  | 2022 Notes |  | 2018 Notes |  | 2020 Notes |  | 2022 Notes
Contractual interest expense | $ | 656 |  |  | $ | 937 |  |  | $ | 719 |  |  | $ | 656 |  |  | $ | 938 |  |  | $ | — |
Interest cost related to amortization of debt issuance costs | 352 |  |  | 168 |  |  | 714 |  |  | 352 |  |  | 168 |  |  | — |
Interest cost related to amortization of the debt discount | 4,283 |  |  | 2,561 |  |  | 10,061 |  |  | 4,044 |  |  | 2,406 |  |  | — |

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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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