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Fair Value Measurements (Tables) | 6 Months Ended
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Jul. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table presents information about the Company’s financial assets and liabilities that are measured at fair value on a recurring basis using the above input categories (in thousands):
| As of July 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (unaudited)
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 155,347 |  |  | $ | — |  |  | $ | — |  |  | $ | 155,347 |
Commercial paper | — |  |  | 12,237 |  |  | — |  |  | 12,237 |
Total cash equivalents | $ | 155,347 |  |  | $ | 12,237 |  |  | $ | — |  |  | $ | 167,584 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper | $ | — |  |  | $ | 56,191 |  |  | $ | — |  |  | $ | 56,191 |
U.S. treasury securities | — |  |  | 247,864 |  |  | — |  |  | 247,864 |
Corporate debt securities | — |  |  | 39,319 |  |  | — |  |  | 39,319 |
Total short-term investments | — |  |  | 343,374 |  |  | — |  |  | 343,374 |
Total cash equivalents and short-term investments | $ | 155,347 |  |  | $ | 355,611 |  |  | $ | — |  |  | $ | 510,958 |
| As of January 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 90,770 |  |  | $ | — |  |  | $ | — |  |  | $ | 90,770 |
Total cash equivalents | $ | 90,770 |  |  | $ | — |  |  | $ | — |  |  | $ | 90,770 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper | $ | — |  |  | $ | 15,946 |  |  | $ | — |  |  | $ | 15,946 |
U.S. treasury securities | — |  |  | 61,738 |  |  | — |  |  | 61,738 |
Corporate debt securities | — |  |  | 24,081 |  |  | — |  |  | 24,081 |
Total short-term investments | — |  |  | 101,765 |  |  | — |  |  | 101,765 |
Total cash equivalents and short-term investments | $ | 90,770 |  |  | $ | 101,765 |  |  | $ | — |  |  | $ | 192,535 |
Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note | The following table presents the carrying amounts and estimated fair values of our financial instruments that are not recorded at fair value on the condensed consolidated balance sheets (in thousands):
| As of July 31, 2018
| Net Carrying Amount Before Unamortized Debt Issuance Costs |  | Estimated Fair Value
| (unaudited)
Convertible senior notes | $ | 270,972 |  |  | $ | 421,800 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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