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Marketable Securities | 3 Months Ended
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Apr. 30, 2023
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 April 30, 2023, January 31, 2023 and April 30, 2022 were as follows:
|  | 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 |
Municipal and pre-refunded municipal bonds |  |  | 45,467 |  |  |  | — |  |  |  | (547 | ) |  |  | 44,920 |
Commercial paper |  |  | 35,874 |  |  |  | — |  |  |  | — |  |  |  | 35,874 |
US Treasury securities |  |  | 22,903 |  |  |  | 1 |  |  |  | (16 | ) |  |  | 22,888 |
Federal government agencies |  |  | 21,284 |  |  |  | — |  |  |  | (28 | ) |  |  | 21,256 |
|  |  | 211,580 |  |  |  | 2 |  |  |  | (1,805 | ) |  |  | 209,777 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 42,823 |  |  |  | 17 |  |  |  | (2,141 | ) |  |  | 40,699 |
Municipal and pre-refunded municipal bonds |  |  | 19,071 |  |  |  | 5 |  |  |  | (906 | ) |  |  | 18,170 |
Federal government agencies |  |  | 14,340 |  |  |  | 9 |  |  |  | (37 | ) |  |  | 14,312 |
Mutual funds, held in rabbi trust |  |  | 12,656 |  |  |  | 132 |  |  |  | (62 | ) |  |  | 12,726 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
|  |  | 89,139 |  |  |  | 163 |  |  |  | (3,146 | ) |  |  | 86,156 |
|  | $ | 300,719 |  |  | $ | 165 |  |  | $ | (4,951 | ) |  | $ | 295,933 |
As of January 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 83,184 |  |  | $ | — |  |  | $ | (947 | ) |  | $ | 82,237 |
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 |
Federal government agencies |  |  | 6,501 |  |  |  | — |  |  |  | (1 | ) |  |  | 6,500 |
|  |  | 183,023 |  |  |  | 1 |  |  |  | (1,646 | ) |  |  | 181,378 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 62,594 |  |  |  | 22 |  |  |  | (3,319 | ) |  |  | 59,297 |
Municipal and pre-refunded municipal bonds |  |  | 23,437 |  |  |  | 5 |  |  |  | (1,154 | ) |  |  | 22,288 |
Federal government agencies |  |  | 9,021 |  |  |  | 13 |  |  |  | (2 | ) |  |  | 9,032 |
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 April 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 85,474 |  |  | $ | — |  |  | $ | (857 | ) |  | $ | 84,617 |
Municipal and pre-refunded municipal bonds |  |  | 86,134 |  |  |  | — |  |  |  | (633 | ) |  |  | 85,501 |
Commercial paper |  |  | 7,789 |  |  |  | — |  |  |  | — |  |  |  | 7,789 |
US Treasury securities |  |  | 9,749 |  |  |  | — |  |  |  | (93 | ) |  |  | 9,656 |
|  |  | 189,146 |  |  |  | — |  |  |  | (1,583 | ) |  |  | 187,563 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 117,403 |  |  |  | — |  |  |  | (4,904 | ) |  |  | 112,499 |
Municipal and pre-refunded municipal bonds |  |  | 53,928 |  |  |  | — |  |  |  | (2,081 | ) |  |  | 51,847 |
Federal government agencies |  |  | 350 |  |  |  | — |  |  |  | (12 | ) |  |  | 338 |
US Treasury securities |  |  | 3,226 |  |  |  | — |  |  |  | (138 | ) |  |  | 3,088 |
Mutual funds, held in rabbi trust |  |  | 12,393 |  |  |  | — |  |  |  | (956 | ) |  |  | 11,437 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
|  |  | 187,549 |  |  |  | — |  |  |  | (8,091 | ) |  |  | 179,458 |
|  | $ | 376,695 |  |  | $ | — |  |  | $ | (9,674 | ) |  | $ | 367,021 |
Proceeds from the sales and maturities of available-for-sale securities were $69,456 and $106,043 for the three months ended April 30, 2023 and 2022, respectively. The Company included in “Other income (loss), net,” in the Condensed Consolidated Statements of Income, a net realized gain of $1 and a net realized loss of $112 for the three months ended April 30, 2023 and 2022, respectively. Amortization of discounts and premiums, net, was $278 and $1,657 for the three months ended April 30, 2023 and 2022, respectively. Amortization of discounts and premiums, net, is included in “Other income (loss), 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 (loss), net” in the Condensed Consolidated Statements of Income.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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