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Cash Equivalents and Short-Term Investments (Tables) | 6 Months Ended
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Jul. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments | The amortized cost, unrealized gain (loss) and estimated fair value of the Company’s cash equivalents and short-term investments as of July 31, 2018 and January 31, 2018 were as follows (in thousands):
| As of July 31, 2018
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
| (unaudited)
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 155,347 |  |  | $ | — |  |  | $ | — |  |  | $ | 155,347 |
Commercial paper | 12,237 |  |  | — |  |  | — |  |  | 12,237 |
Total cash equivalents | $ | 167,584 |  |  | $ | — |  |  | $ | — |  |  | $ | 167,584 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper | $ | 56,191 |  |  | $ | — |  |  | $ | — |  |  | $ | 56,191 |
U.S. treasury securities | 248,081 |  |  | — |  |  | (217 | ) |  | 247,864 |
Corporate debt securities | 39,352 |  |  | 6 |  |  | (39 | ) |  | 39,319 |
Total short-term investments | 343,624 |  |  | 6 |  |  | (256 | ) |  | 343,374 |
Total | $ | 511,208 |  |  | $ | 6 |  |  | $ | (256 | ) |  | $ | 510,958 |
| As of January 31, 2018
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
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 | 61,896 |  |  | — |  |  | (158 | ) |  | 61,738 |
Corporate debt securities | 24,125 |  |  | — |  |  | (44 | ) |  | 24,081 |
Total short-term investments | 101,967 |  |  | — |  |  | (202 | ) |  | 101,765 |
Total | $ | 192,737 |  |  | $ | — |  |  | $ | (202 | ) |  | $ | 192,535 |
Schedule of Contractual Maturities of Short-term Investments | The following tables present the contractual maturities of the Company’s short-term investments as of July 31, 2018 and January 31, 2018 (in thousands):
| As of July 31, 2018 |  | As of January 31, 2018
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
| (unaudited) |  |  |  |
Due within one year | $ | 328,694 |  |  | $ | 328,460 |  |  | $ | 93,421 |  |  | $ | 93,237 |
Due between one to five years | 14,930 |  |  | 14,914 |  |  | 8,546 |  |  | 8,528 |
| $ | 343,624 |  |  | $ | 343,374 |  |  | $ | 101,967 |  |  | $ | 101,765 |

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