Fair Value Measurements and Marketable Securities - Financial Assets and Liabilities (Details) - Recurring - USD ($) $ in Thousands |
Apr. 30, 2021 |
Jan. 31, 2021 |
|---|---|---|
| Assets | ||
| Total assets | $ 429,502 | $ 0 |
| Level 1 | ||
| Assets | ||
| Total assets | 429,502 | 0 |
| Level 2 | ||
| Assets | ||
| Total assets | 0 | 0 |
| Level 3 | ||
| Assets | ||
| Total assets | 0 | 0 |
| Money market funds | ||
| Assets | ||
| Cash equivalents | 429,502 | 0 |
| Money market funds | Level 1 | ||
| Assets | ||
| Cash equivalents | 429,502 | 0 |
| Money market funds | Level 2 | ||
| Assets | ||
| Cash equivalents | 0 | 0 |
| Money market funds | Level 3 | ||
| Assets | ||
| Cash equivalents | $ 0 | $ 0 |