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Fair Value Measurements - Marketable Securities (Details) - U.S. government treasury securities - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2023 | Oct. 31, 2023 | Jan. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amortized cost, due withen one year |  | $ 638,309 | $ 1,383,226
Amortized cost, due after one year and withen three years |  | 818,757 | 0
Amortized cost, total |  | 1,457,066 | 1,383,226
Unrealized loss, due withen one year | $ (2,422) | (1,553) |
Unrealized loss, due after one year and withen three years | 0 | (8,478) |
Unrealized loss, total | $ 2,422 | 10,031 |
Short-term investments |  | 636,756 | 1,380,804
Marketable securities, non-current |  | 810,279 | 0
Total short-term investments |  | $ 1,447,035 | $ 1,380,804

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