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Marketable Securities | 9 Months Ended
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Oct. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities The following is a summary of available-for-sale marketable securities, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets:
| October 31, 2023
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair value
Corporate bonds | $ | 86,108 |  |  | $ | 4 |  |  | $ | (90) |  |  | $ | 86,022 |
Municipal bonds | 6,677 |  |  | — |  |  | — |  |  | 6,677 |
U.S. government and agency securities | 164,259 |  |  | 22 |  |  | (152) |  |  | 164,129 |
Certificates of deposit | 57,087 |  |  | 10 |  |  | (18) |  |  | 57,079 |
Commercial paper | 170,224 |  |  | 2 |  |  | (164) |  |  | 170,062 |
Marketable securities | $ | 484,355 |  |  | $ | 38 |  |  | $ | (424) |  |  | $ | 483,969 |
| January 31, 2023
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair value
Corporate bonds | $ | 39,922 |  |  | $ | 8 |  |  | $ | (68) |  |  | $ | 39,862 |
Municipal bonds | 12,429 |  |  | 22 |  |  | — |  |  | 12,451 |
U.S. government and agency securities | 128,898 |  |  | 6 |  |  | (367) |  |  | 128,537 |
Certificates of deposit | 59,546 |  |  | 28 |  |  | (155) |  |  | 59,419 |
Commercial paper | 150,131 |  |  | 41 |  |  | (202) |  |  | 149,970 |
Marketable securities | $ | 390,926 |  |  | $ | 105 |  |  | $ | (792) |  |  | $ | 390,239 |
As of October 31, 2023 and January 31, 2023, the maturities of available-for-sale marketable securities did not exceed 12 months. Interest income from cash and cash equivalents and marketable securities was $7.8 million and $21.7 million for the three and nine months ended October 31, 2023, respectively, and $2.5 million and $4.1 million for the three and nine months ended October 31, 2022, respectively. The estimated fair value of debt securities in an unrealized loss position for which an allowance for credit losses has not been recorded was $393.3 million and $220.9 million as of October 31, 2023 and January 31, 2023, respectively. There are no expected credit losses that have been recorded against the Company’s investment securities as of October 31, 2023 and January 31, 2023. Unrealized losses on the Company’s debt securities are not considered to be credit-related based upon an analysis that considered the extent to which the fair value is less than the amortized basis of a security, adverse conditions specifically related to the security, changes to credit rating of the instrument subsequent to Company purchase, and the strength of the underlying collateral, if any. Refer to Note 5, Fair Value Measurements, for information about the fair value of the Company’s fair value hierarchy for short-term marketable securities.

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