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v3.23.2

Marketable Securities (Tables) | 6 Months Ended
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Jul. 31, 2023
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 July 31, 2023, January 31, 2023 and July 31, 2022 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of July 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 96,902 |  |  | $ | 1 |  |  | $ | (1,239 | ) |  | $ | 95,664 |
Federal government agencies |  |  | 47,287 |  |  |  | — |  |  |  | (163 | ) |  |  | 47,124 |
Municipal and pre-refunded municipal bonds |  |  | 48,350 |  |  |  | — |  |  |  | (670 | ) |  |  | 47,680 |
Commercial paper |  |  | 41,719 |  |  |  | — |  |  |  | — |  |  |  | 41,719 |
US Treasury securities |  |  | 18,661 |  |  |  | — |  |  |  | (16 | ) |  |  | 18,645 |
|  |  | 252,919 |  |  |  | 1 |  |  |  | (2,088 | ) |  |  | 250,832 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 47,835 |  |  |  | — |  |  |  | (1,745 | ) |  |  | 46,090 |
Federal government agencies |  |  | 44,914 |  |  |  | — |  |  |  | (464 | ) |  |  | 44,450 |
Municipal and pre-refunded municipal bonds |  |  | 13,980 |  |  |  | — |  |  |  | (469 | ) |  |  | 13,511 |
US Treasury securities |  |  | 2,969 |  |  |  | — |  |  |  | (61 | ) |  |  | 2,908 |
Mutual funds, held in rabbi trust |  |  | 12,941 |  |  |  | 1,027 |  |  |  | (70 | ) |  |  | 13,898 |
Certificates of deposit |  |  | 1,499 |  |  |  | — |  |  |  | — |  |  |  | 1,499 |
|  |  | 124,138 |  |  |  | 1,027 |  |  |  | (2,809 | ) |  |  | 122,356 |
|  | $ | 377,057 |  |  | $ | 1,028 |  |  | $ | (4,897 | ) |  | $ | 373,188 |
As of January 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 83,184 |  |  | $ | — |  |  | $ | (947 | ) |  | $ | 82,237 |
Federal government agencies |  |  | 6,501 |  |  |  | — |  |  |  | (1 | ) |  |  | 6,500 |
Municipal and pre-refunded municipal bonds |  |  | 48,141 |  |  |  | — |  |  |  | (688 | ) |  |  | 47,453 |
Commercial paper |  |  | 21,636 |  |  |  | — |  |  |  | — |  |  |  | 21,636 |
US Treasury securities |  |  | 23,561 |  |  |  | 1 |  |  |  | (10 | ) |  |  | 23,552 |
|  |  | 183,023 |  |  |  | 1 |  |  |  | (1,646 | ) |  |  | 181,378 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 62,594 |  |  |  | 22 |  |  |  | (3,319 | ) |  |  | 59,297 |
Federal government agencies |  |  | 9,021 |  |  |  | 13 |  |  |  | (2 | ) |  |  | 9,032 |
Municipal and pre-refunded municipal bonds |  |  | 23,437 |  |  |  | 5 |  |  |  | (1,154 | ) |  |  | 22,288 |
Mutual funds, held in rabbi trust |  |  | 13,402 |  |  |  | — |  |  |  | (1,424 | ) |  |  | 11,978 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
|  |  | 108,703 |  |  |  | 40 |  |  |  | (5,899 | ) |  |  | 102,844 |
|  | $ | 291,726 |  |  | $ | 41 |  |  | $ | (7,545 | ) |  | $ | 284,222 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of July 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 76,652 |  |  | $ | — |  |  | $ | (1,211 | ) |  | $ | 75,441 |
Municipal and pre-refunded municipal bonds |  |  | 75,518 |  |  |  | — |  |  |  | (595 | ) |  |  | 74,923 |
US Treasury securities |  |  | 9,749 |  |  |  | — |  |  |  | (93 | ) |  |  | 9,656 |
|  |  | 161,919 |  |  |  | — |  |  |  | (1,899 | ) |  |  | 160,020 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 96,086 |  |  |  | — |  |  |  | (4,160 | ) |  |  | 91,926 |
Federal government agencies |  |  | 350 |  |  |  | — |  |  |  | (12 | ) |  |  | 338 |
Municipal and pre-refunded municipal bonds |  |  | 47,437 |  |  |  | — |  |  |  | (1,858 | ) |  |  | 45,579 |
US Treasury securities |  |  | 3,229 |  |  |  | — |  |  |  | (129 | ) |  |  | 3,100 |
Mutual funds, held in rabbi trust |  |  | 12,361 |  |  |  | — |  |  |  | (1,025 | ) |  |  | 11,336 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
|  |  | 159,712 |  |  |  | — |  |  |  | (7,184 | ) |  |  | 152,528 |
|  | $ | 321,631 |  |  | $ | — |  |  | $ | (9,083 | ) |  | $ | 312,548 |

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