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Marketable Securities (Tables) | 3 Months Ended
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Apr. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities | The amortized cost, gross unrealized gains (losses) and fair value of available-for-sale securities by major security type and class of security as of April 30, 2024, January 31, 2023 and April 30, 2023 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of April 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 145,891 |  |  | $ | 3 |  |  | $ | (1,000 | ) |  | $ | 144,894 |
Federal government agencies |  |  | 76,515 |  |  |  | — |  |  |  | (204 | ) |  |  | 76,311 |
Municipal and pre-refunded municipal bonds |  |  | 49,515 |  |  |  | 4 |  |  |  | (204 | ) |  |  | 49,315 |
US Treasury securities |  |  | 28,925 |  |  |  | — |  |  |  | (127 | ) |  |  | 28,798 |
Certificates of deposit |  |  | 10,249 |  |  |  | — |  |  |  | — |  |  |  | 10,249 |
Commercial paper |  |  | 2,991 |  |  |  | — |  |  |  | — |  |  |  | 2,991 |
|  |  | 314,086 |  |  |  | 7 |  |  |  | (1,535 | ) |  |  | 312,558 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 119,907 |  |  |  | 19 |  |  |  | (1,116 | ) |  |  | 118,810 |
Federal government agencies |  |  | 53,486 |  |  |  | — |  |  |  | (502 | ) |  |  | 52,984 |
Municipal and pre-refunded municipal bonds |  |  | 38,785 |  |  |  | 9 |  |  |  | (286 | ) |  |  | 38,508 |
US Treasury securities |  |  | 49,943 |  |  |  | — |  |  |  | (677 | ) |  |  | 49,266 |
Certificates of deposit |  |  | 11,250 |  |  |  | — |  |  |  | — |  |  |  | 11,250 |
Mutual funds, held in rabbi trust |  |  | 15,950 |  |  |  | 443 |  |  |  | (33 | ) |  |  | 16,360 |
|  |  | 289,321 |  |  |  | 471 |  |  |  | (2,614 | ) |  |  | 287,178 |
|  | $ | 603,407 |  |  | $ | 478 |  |  | $ | (4,149 | ) |  | $ | 599,736 |
As of January 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 123,418 |  |  | $ | 27 |  |  | $ | (883 | ) |  | $ | 122,562 |
Federal government agencies |  |  | 68,730 |  |  |  | 35 |  |  |  | (94 | ) |  |  | 68,671 |
Municipal and pre-refunded municipal bonds |  |  | 47,915 |  |  |  | 9 |  |  |  | (414 | ) |  |  | 47,510 |
US Treasury securities |  |  | 27,231 |  |  |  | — |  |  |  | (36 | ) |  |  | 27,195 |
Certificates of deposit |  |  | 10,249 |  |  |  | — |  |  |  | — |  |  |  | 10,249 |
Commercial paper |  |  | 10,557 |  |  |  | — |  |  |  | — |  |  |  | 10,557 |
|  |  | 288,100 |  |  |  | 71 |  |  |  | (1,427 | ) |  |  | 286,744 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 147,924 |  |  |  | 441 |  |  |  | (388 | ) |  |  | 147,977 |
Federal government agencies |  |  | 65,698 |  |  |  | 138 |  |  |  | (94 | ) |  |  | 65,742 |
Municipal and pre-refunded municipal bonds |  |  | 39,243 |  |  |  | 160 |  |  |  | (35 | ) |  |  | 39,368 |
US Treasury securities |  |  | 34,604 |  |  |  | 169 |  |  |  | (26 | ) |  |  | 34,747 |
Certificates of deposit |  |  | 11,250 |  |  |  | — |  |  |  | — |  |  |  | 11,250 |
Mutual funds, held in rabbi trust |  |  | 13,817 |  |  |  | 1,344 |  |  |  | (93 | ) |  |  | 15,068 |
|  |  | 312,536 |  |  |  | 2,252 |  |  |  | (636 | ) |  |  | 314,152 |
|  | $ | 600,636 |  |  | $ | 2,323 |  |  | $ | (2,063 | ) |  | $ | 600,896 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of April 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 86,052 |  |  | $ | 1 |  |  | $ | (1,214 | ) |  | $ | 84,839 |
Federal government agencies |  |  | 21,284 |  |  |  | — |  |  |  | (28 | ) |  |  | 21,256 |
Municipal and pre-refunded municipal bonds |  |  | 45,467 |  |  |  | — |  |  |  | (547 | ) |  |  | 44,920 |
US Treasury securities |  |  | 22,903 |  |  |  | 1 |  |  |  | (16 | ) |  |  | 22,888 |
Commercial paper |  |  | 35,874 |  |  |  | — |  |  |  | — |  |  |  | 35,874 |
|  |  | 211,580 |  |  |  | 2 |  |  |  | (1,805 | ) |  |  | 209,777 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 42,823 |  |  |  | 17 |  |  |  | (2,141 | ) |  |  | 40,699 |
Federal government agencies |  |  | 14,340 |  |  |  | 9 |  |  |  | (37 | ) |  |  | 14,312 |
Municipal and pre-refunded municipal bonds |  |  | 19,071 |  |  |  | 5 |  |  |  | (906 | ) |  |  | 18,170 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
Mutual funds, held in rabbi trust |  |  | 12,656 |  |  |  | 132 |  |  |  | (62 | ) |  |  | 12,726 |
|  |  | 89,139 |  |  |  | 163 |  |  |  | (3,146 | ) |  |  | 86,156 |
|  | $ | 300,719 |  |  | $ | 165 |  |  | $ | (4,951 | ) |  | $ | 295,933 |

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