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Debt and Financing Arrangements (Tables) | 6 Months Ended
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Jul. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Interest Expense | The following table sets forth total interest expense recognized related to the 2023 Notes (in thousands):
| Three Months Ended July 31, 2018 |  | Six Months Ended July 31, 2018
| (unaudited)
Contractual interest expense | $ | 216 |  |  | $ | 362 |
Amortization of debt issuance costs | 288 |  |  | 478 |
Amortization of debt discount | 3,554 |  |  | 5,935 |
Total | $ | 4,058 |  |  | $ | 6,775 |
Schedule of Liability and Equity Component of 2023 Notes | The 2023 Notes, net consisted of the following (in thousands):
| As of July 31, 2018
| (unaudited)
Liability component: |
Principal | $ | 345,000 |
Less: unamortized debt issuance costs and debt discount | (81,238 | )
Net carrying amount | $ | 263,762 |
| At Issuance
| (unaudited)
Equity component: |
2023 Notes | $ | 79,962 |
Less: issuance costs | (2,320 | )
Carrying amount of the equity component(1) | $ | 77,642 |
(1) Included in the condensed consolidated balance sheets within Additional paid-in capital.

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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 information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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