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Cash Equivalents and Short-term Investments (Tables) | 12 Months Ended
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Jan. 31, 2020
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 January 31, 2020 and 2019 were as follows (in thousands):
| As of January 31, 2020
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 416,584 |  |  | $ | — |  |  | $ | — |  |  | $ | 416,584 |
U.S. treasury securities | 19,996 |  |  | — |  |  | — |  |  | 19,996 |
Total cash equivalents | 436,580 |  |  | — |  |  | — |  |  | 436,580 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | 575,920 |  |  | 686 |  |  | (8 | ) |  | 576,598 |
Corporate debt securities | 305,859 |  |  | 519 |  |  | — |  |  | 306,378 |
Total short-term investments | 881,779 |  |  | 1,205 |  |  | (8 | ) |  | 882,976 |
Total | $ | 1,318,359 |  |  | $ | 1,205 |  |  | $ | (8 | ) |  | $ | 1,319,556 |
| As of January 31, 2019
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 247,426 |  |  | $ | — |  |  | $ | — |  |  | $ | 247,426 |
Corporate debt securities | 3,409 |  |  | — |  |  | (1 | ) |  | 3,408 |
Total cash equivalents | 250,835 |  |  | — |  |  | (1 | ) |  | 250,834 |
Short-term investments: |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | 195,913 |  |  | 37 |  |  | (53 | ) |  | 195,897 |
Corporate debt securities | 69,483 |  |  | 13 |  |  | (19 | ) |  | 69,477 |
Total short-term investments | 265,396 |  |  | 50 |  |  | (72 | ) |  | 265,374 |
Total | $ | 516,231 |  |  | $ | 50 |  |  | $ | (73 | ) |  | $ | 516,208 |
Schedule of Contractual Maturities of Short-term Investments | The Company's short-term investments as of January 31, 2020 and 2019 all mature within one year, as follows (in thousands):
| As of January 31, 2020 |  | As of January 31, 2019
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due within one year | $ | 881,779 |  |  | $ | 882,976 |  |  | $ | 265,396 |  |  | $ | 265,374 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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