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Marketable Securities | 9 Months Ended
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Oct. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | 3. Marketable Securities During all periods shown, marketable securities are classified as available-for-sale. 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 October 31, 2024, January 31, 2024 and October 31, 2023 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of October 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 178,736 |  |  | $ | 151 |  |  | $ | (187 | ) |  | $ | 178,700 |
Federal government agencies |  |  | 72,598 |  |  |  | 71 |  |  |  | (20 | ) |  |  | 72,649 |
Municipal and pre-refunded municipal bonds |  |  | 64,129 |  |  |  | 70 |  |  |  | (33 | ) |  |  | 64,166 |
US Treasury securities |  |  | 1,491 |  |  |  | — |  |  |  | (3 | ) |  |  | 1,488 |
Certificates of deposit |  |  | 20,499 |  |  |  | — |  |  |  | — |  |  |  | 20,499 |
Commercial paper |  |  | 2,943 |  |  |  | — |  |  |  | — |  |  |  | 2,943 |
|  |  | 340,396 |  |  |  | 292 |  |  |  | (243 | ) |  |  | 340,445 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 110,302 |  |  |  | 266 |  |  |  | (398 | ) |  |  | 110,170 |
Federal government agencies |  |  | 35,098 |  |  |  | 16 |  |  |  | (285 | ) |  |  | 34,829 |
Municipal and pre-refunded municipal bonds |  |  | 16,778 |  |  |  | 30 |  |  |  | (12 | ) |  |  | 16,796 |
US Treasury securities |  |  | 59,507 |  |  |  | 197 |  |  |  | (51 | ) |  |  | 59,653 |
Certificates of deposit |  |  | 1,000 |  |  |  | — |  |  |  | — |  |  |  | 1,000 |
Mutual funds, held in rabbi trust |  |  | 15,756 |  |  |  | 2,035 |  |  |  | (2 | ) |  |  | 17,789 |
|  |  | 238,441 |  |  |  | 2,544 |  |  |  | (748 | ) |  |  | 240,237 |
|  | $ | 578,837 |  |  | $ | 2,836 |  |  | $ | (991 | ) |  | $ | 580,682 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
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 October 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 102,766 |  |  | $ | — |  |  | $ | (1,336 | ) |  | $ | 101,430 |
Federal government agencies |  |  | 66,216 |  |  |  | — |  |  |  | (233 | ) |  |  | 65,983 |
Municipal and pre-refunded municipal bonds |  |  | 48,115 |  |  |  | — |  |  |  | (727 | ) |  |  | 47,388 |
US Treasury securities |  |  | 13,157 |  |  |  | — |  |  |  | (7 | ) |  |  | 13,150 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
Commercial paper |  |  | 20,976 |  |  |  | — |  |  |  | — |  |  |  | 20,976 |
|  |  | 251,479 |  |  |  | — |  |  |  | (2,303 | ) |  |  | 249,176 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 53,555 |  |  |  | 4 |  |  |  | (1,155 | ) |  |  | 52,404 |
Federal government agencies |  |  | 49,203 |  |  |  | — |  |  |  | (388 | ) |  |  | 48,815 |
Municipal and pre-refunded municipal bonds |  |  | 10,224 |  |  |  | 3 |  |  |  | (136 | ) |  |  | 10,091 |
US Treasury securities |  |  | 7,398 |  |  |  | 1 |  |  |  | (71 | ) |  |  | 7,328 |
Certificates of deposit |  |  | 1,250 |  |  |  | — |  |  |  | — |  |  |  | 1,250 |
Mutual funds, held in rabbi trust |  |  | 13,252 |  |  |  | 147 |  |  |  | (348 | ) |  |  | 13,051 |
|  |  | 134,882 |  |  |  | 155 |  |  |  | (2,098 | ) |  |  | 132,939 |
|  | $ | 386,361 |  |  | $ | 155 |  |  | $ | (4,401 | ) |  | $ | 382,115 |
Proceeds from the sales and maturities of available-for-sale securities were $309,178 and $242,847 for the nine months ended October 31, 2024 and 2023, respectively. The Company included in “Other income, net,” in the Condensed Consolidated Statements of Income, a net realized loss of $17 and $96 for the three and nine months ended October 31, 2024, respectively, and a net realized gain of $2 and a net realized loss of $4 for the three and nine months ended October 31, 2023, respectively. Amortization of discounts and premiums, net, resulted in a benefit of $1,832 and $6,053 for the three and nine months ended October 31, 2024, respectively, and a benefit of $1,406 and $2,578 for the three and nine months ended October 31, 2023, respectively. Amortization of discounts and premiums, net, is included in “Other income, net” in the Condensed Consolidated Statements of Income. Mutual funds represent assets held in an irrevocable rabbi trust for the Company’s Non-qualified Deferred Compensation Plan (“NQDC”). These assets are a source of funds to match the funding obligations to participants in the NQDC but are subject to the Company’s general creditors. The Company elected the fair value option for financial assets for the mutual funds held in the rabbi trust resulting in all unrealized gains and losses being recorded in “Other income, net” in the Condensed Consolidated Statements of Income.

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