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Short-Term Investments (Tables) | 3 Months Ended
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Apr. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Short-Term Investments | As of April 30, 2024, 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 | $ | 98,650 |  |  | $ | 23 |  |  | $ | (55) |  |  | $ | 98,618 |
Asset-backed securities | 659,618 |  |  | 571 |  |  | (3,834) |  |  | 656,355 |
Commercial paper | 284,131 |  |  | 6 |  |  | (119) |  |  | 284,018 |
Corporate notes and bonds | 1,719,063 |  |  | 673 |  |  | (12,669) |  |  | 1,707,067 |
Foreign government bonds | 54,834 |  |  | — |  |  | (456) |  |  | 54,378 |
Municipal securities | 76,780 |  |  | 41 |  |  | (473) |  |  | 76,348 |
U.S. agency obligations | 55,920 |  |  | — |  |  | (211) |  |  | 55,709 |
U.S. treasury securities | 642,726 |  |  | — |  |  | (7,378) |  |  | 635,348 |
Total available-for-sale securities | $ | 3,591,722 |  |  | $ | 1,314 |  |  | $ | (25,195) |  |  | $ | 3,567,841 |
As of January 31, 2024, 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 | $ | 94,210 |  |  | $ | 87 |  |  | $ | (14) |  |  | $ | 94,283 |
Asset-backed securities | 605,852 |  |  | 2,916 |  |  | (1,787) |  |  | 606,981 |
Commercial paper | 144,218 |  |  | 47 |  |  | (20) |  |  | 144,245 |
Corporate notes and bonds | 1,581,382 |  |  | 8,835 |  |  | (5,188) |  |  | 1,585,029 |
Foreign government bonds | 50,180 |  |  | 206 |  |  | (180) |  |  | 50,206 |
Municipal securities | 79,404 |  |  | 301 |  |  | (231) |  |  | 79,474 |
U.S. agency obligations | 49,372 |  |  | 232 |  |  | (12) |  |  | 49,592 |
U.S. treasury securities | 717,015 |  |  | 1,268 |  |  | (3,824) |  |  | 714,459 |
Total available-for-sale securities | $ | 3,321,633 |  |  | $ | 13,892 |  |  | $ | (11,256) |  |  | $ | 3,324,269 |
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):
| April 30, 2024 |  | January 31, 2024
Due in one year or less | $ | 1,164,946 |  |  | $ | 919,871 |
Due in greater than one year | 2,402,895 |  |  | 2,404,398 |
Total | $ | 3,567,841 |  |  | $ | 3,324,269 |
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 April 30, 2024 (in thousands):
| 12 months or less |  | Greater than 12 months
| Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses
Certificates of deposits | $ | 66,055 |  |  | $ | (55) |  |  | $ | — |  |  | $ | — |
Asset-backed securities | 415,388 |  |  | (2,530) |  |  | 91,285 |  |  | (1,304) |
Commercial paper | 257,932 |  |  | (119) |  |  | — |  |  | — |
Corporate notes and bonds | 1,191,177 |  |  | (9,496) |  |  | 235,212 |  |  | (3,173) |
Foreign government bonds | 41,939 |  |  | (336) |  |  | 12,439 |  |  | (120) |
Municipal securities | 44,941 |  |  | (392) |  |  | 16,998 |  |  | (81) |
U.S. agency obligations | 55,709 |  |  | (211) |  |  | — |  |  | — |
U.S. treasury securities | 498,599 |  |  | (5,163) |  |  | 136,749 |  |  | (2,215) |
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, 2024 (in thousands):
| 12 months or less |  | Greater than 12 months
| Fair value |  | Gross unrealized losses |  | Fair Value |  | Gross unrealized losses
Certificates of deposits | $ | 22,465 |  |  | $ | (14) |  |  | $ | — |  |  | $ | — |
Asset-backed securities | 120,543 |  |  | (343) |  |  | 105,419 |  |  | (1,444) |
Commercial paper | 70,037 |  |  | (20) |  |  | — |  |  | — |
Corporate notes and bonds | 394,823 |  |  | (1,560) |  |  | 280,092 |  |  | (3,628) |
Foreign government bonds | 8,915 |  |  | (19) |  |  | 9,784 |  |  | (161) |
Municipal securities | 31,418 |  |  | (122) |  |  | 13,686 |  |  | (109) |
U.S. agency obligations | 1,795 |  |  | (3) |  |  | 4,991 |  |  | (9) |
U.S. treasury securities | 280,946 |  |  | (1,227) |  |  | 204,274 |  |  | (2,597) |

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