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Short-Term Investments (Tables) | 9 Months Ended
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Oct. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Short-Term Investments | As of October 31, 2023, short-term investments consisted of the following (in thousands):
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Estimated fair value
Available-for-sale securities: |  |  |  |  |  |  |
Certificates of deposits | $ | 111,560 |  |  | $ | 21 |  |  | $ | (98) |  |  | $ | 111,483 |
Asset-backed securities | 576,705 |  |  | 86 |  |  | (6,289) |  |  | 570,502 |
Commercial paper | 193,975 |  |  | 1 |  |  | (203) |  |  | 193,773 |
Corporate notes and bonds | 1,424,054 |  |  | 344 |  |  | (19,026) |  |  | 1,405,372 |
Foreign government bonds | 32,371 |  |  | — |  |  | (422) |  |  | 31,949 |
Municipal securities | 73,217 |  |  | 6 |  |  | (803) |  |  | 72,420 |
U.S. agency obligations | 49,169 |  |  | — |  |  | (256) |  |  | 48,913 |
U.S. treasury securities | 774,397 |  |  | 4 |  |  | (10,243) |  |  | 764,158 |
Total available-for-sale securities | $ | 3,235,448 |  |  | $ | 462 |  |  | $ | (37,340) |  |  | $ | 3,198,570 |
As of January 31, 2023, short-term investments consisted of the following (in thousands):
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Estimated fair value
Available-for-sale securities: |  |  |  |  |  |  |
Certificates of deposits | $ | 37,998 |  |  | $ | 31 |  |  | $ | (66) |  |  | $ | 37,963 |
Asset-backed securities | 448,081 |  |  | 585 |  |  | (5,708) |  |  | 442,958 |
Commercial paper | 155,097 |  |  | 8 |  |  | (580) |  |  | 154,525 |
Corporate notes and bonds | 1,224,195 |  |  | 1,649 |  |  | (17,880) |  |  | 1,207,964 |
Foreign government bonds | 24,654 |  |  | 13 |  |  | (516) |  |  | 24,151 |
U.S. agency obligations | 32,995 |  |  | 4 |  |  | (594) |  |  | 32,405 |
U.S. treasury securities | 321,946 |  |  | 265 |  |  | (6,014) |  |  | 316,197 |
Total available-for-sale securities | $ | 2,244,966 |  |  | $ | 2,555 |  |  | $ | (31,358) |  |  | $ | 2,216,163 |
Schedule of Estimated Fair Value of Short-Term Investments, Designated as Available-for-Sale and Classified by Contractual Maturity | The following table summarizes the estimated fair value of our short-term investments, designated as available-for-sale and classified by the contractual maturity date of the securities as of the dates shown (in thousands):
| October 31, 2023 |  | January 31, 2023
Due in one year or less | $ | 1,112,466 |  |  | $ | 849,673 |
Due in greater than one year | 2,086,104 |  |  | 1,366,490 |
Total | $ | 3,198,570 |  |  | $ | 2,216,163 |
Schedule of Fair Values and Gross Unrealized Loss Position of Available-for-Sale Securities Aggregated by Investment Category | The following table shows the fair values of available-for-sale securities which were in an unrealized loss position, aggregated by investment category, as of October 31, 2023 (in thousands):
| 12 months or less |  | Greater than 12 months
| Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses
Certificates of deposits | $ | 54,902 |  |  | $ | (98) |  |  | $ | — |  |  | $ | — |
Asset-backed securities | 404,973 |  |  | (3,469) |  |  | 135,578 |  |  | (2,820) |
Commercial paper | 180,899 |  |  | (203) |  |  | — |  |  | — |
Corporate notes and bonds | 923,724 |  |  | (11,218) |  |  | 363,115 |  |  | (7,808) |
Foreign government bonds | 22,269 |  |  | (158) |  |  | 9,680 |  |  | (264) |
Municipal securities | 56,692 |  |  | (547) |  |  | 14,214 |  |  | (256) |
U.S. agency obligations | 43,946 |  |  | (223) |  |  | 4,967 |  |  | (33) |
U.S. treasury securities | 542,832 |  |  | (5,613) |  |  | 218,152 |  |  | (4,630) |
The following table shows the fair values of available-for-sale securities which were in an unrealized loss position, aggregated by investment category, as of January 31, 2023 (in thousands):
| 12 months or less |  | Greater than 12 months
| Fair value |  | Gross unrealized losses |  | Fair Value |  | Gross unrealized losses
Certificates of deposits | $ | 15,934 |  |  | $ | (66) |  |  | $ | — |  |  | $ | — |
Asset-backed securities | 293,854 |  |  | (3,219) |  |  | 78,279 |  |  | (2,489) |
Commercial paper | 144,741 |  |  | (580) |  |  | — |  |  | — |
Corporate notes and bonds | 604,264 |  |  | (6,801) |  |  | 370,969 |  |  | (11,079) |
Foreign government bonds | 11,284 |  |  | (126) |  |  | 11,827 |  |  | (390) |
U.S. agency obligations | 4,941 |  |  | (61) |  |  | 24,461 |  |  | (533) |
U.S. treasury securities | 210,246 |  |  | (3,661) |  |  | 63,422 |  |  | (2,353) |

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