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Fair Value Measurements (Details) - USD ($) $ in Thousands | Apr. 30, 2024 | Jan. 31, 2024 | Oct. 31, 2023 | Jun. 30, 2020
--- | --- | --- | --- | ---
Convertible Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Stated interest rate |  |  | 1.50% | 1.25%
Convertible Senior Notes | 2025 Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Stated interest rate | 1.25% |  |  |
Convertible Senior Notes | 2028 Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Stated interest rate | 1.50% |  |  |
Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | $ 332,259 | $ 307,275 |  |
Included in investments | 210,242 | 208,178 |  |
Total | 542,501 | 515,453 |  |
Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total | 325,781 | 305,283 |  |
Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total | 216,720 | 210,170 |  |
Recurring | Level 2 | 2025 Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of convertible senior notes | 54,400 |  |  |
Recurring | Level 2 | 2028 Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of convertible senior notes | 402,300 |  |  |
Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total | 0 | 0 |  |
U.S. Treasury securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 57,681 | 51,034 |  |
U.S. Treasury securities | Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 0 | 0 |  |
U.S. Treasury securities | Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 57,681 | 51,034 |  |
U.S. Treasury securities | Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 0 | 0 |  |
Commercial paper | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 22,582 | 3,880 |  |
Commercial paper | Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 0 | 0 |  |
Commercial paper | Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 22,582 | 3,880 |  |
Commercial paper | Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 0 | 0 |  |
Corporate debt securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 108,484 | 131,259 |  |
Corporate debt securities | Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 0 | 0 |  |
Corporate debt securities | Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 108,484 | 131,259 |  |
Corporate debt securities | Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 0 | 0 |  |
U.S. Government agency securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 27,973 | 23,997 |  |
U.S. Government agency securities | Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 0 | 0 |  |
U.S. Government agency securities | Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 27,973 | 23,997 |  |
U.S. Government agency securities | Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Included in investments | 0 | 0 |  |
Money market funds | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | 325,781 | 305,283 |  |
Money market funds | Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | 325,781 | 305,283 |  |
Money market funds | Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | 0 | 0 |  |
Money market funds | Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds | $ 0 | $ 0 |  |

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