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Cash, Cash Equivalents, and Investments - Carrying Value of Investments (Details) - USD ($) $ in Thousands | Apr. 30, 2021 | Jan. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | $ 230,793 | $ 220,769
Unrealized Gain (Loss), Net | 139 | 343
Recorded Basis | 230,932 | 221,112
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 57,870 | 45,023
Unrealized Gain (Loss), Net | 3 | 3
Recorded Basis | 57,873 | 45,026
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 43,362 | 34,607
Unrealized Gain (Loss), Net | (1) | (9)
Recorded Basis | 43,361 | 34,598
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 129,561 | 141,139
Unrealized Gain (Loss), Net | 137 | 349
Recorded Basis | $ 129,698 | $ 141,488

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