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Marketable Securities | 9 Months Ended
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Oct. 31, 2021
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | 4. 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, 2021, January 31, 2021 and October 31, 2020 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of October 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 53,744 |  |  | $ | 3 |  |  | $ | (71 | ) |  | $ | 53,676 |
Municipal and pre-refunded municipal bonds |  |  | 114,818 |  |  |  | 9 |  |  |  | (73 | ) |  |  | 114,754 |
Treasury bills |  |  | 16,849 |  |  |  | — |  |  |  | (3 | ) |  |  | 16,846 |
Commercial paper |  |  | 3,099 |  |  |  | — |  |  |  | — |  |  |  | 3,099 |
|  |  | 188,510 |  |  |  | 12 |  |  |  | (147 | ) |  |  | 188,375 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 174,884 |  |  |  | 1 |  |  |  | (1,125 | ) |  | $ | 173,760 |
Municipal and pre-refunded municipal bonds |  |  | 78,955 |  |  |  | 8 |  |  |  | (362 | ) |  |  | 78,601 |
Treasury bills |  |  | 4,748 |  |  |  | — |  |  |  | (7 | ) |  |  | 4,741 |
Mutual funds, held in rabbi trust |  |  | 11,540 |  |  |  | 542 |  |  |  | (1 | ) |  |  | 12,081 |
Federal government agencies |  |  | 350 |  |  |  | — |  |  |  | (2 | ) |  |  | 348 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
|  |  | 270,726 |  |  |  | 551 |  |  |  | (1,497 | ) |  |  | 269,780 |
|  | $ | 459,236 |  |  | $ | 563 |  |  | $ | (1,644 | ) |  | $ | 458,155 |
As of January 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 38,695 |  |  | $ | 1 |  |  | $ | (48 | ) |  | $ | 38,648 |
Municipal and pre-refunded municipal bonds |  |  | 127,097 |  |  |  | 11 |  |  |  | (53 | ) |  |  | 127,055 |
Commercial paper |  |  | 8,992 |  |  |  | — |  |  |  | — |  |  |  | 8,992 |
|  |  | 174,784 |  |  |  | 12 |  |  |  | (101 | ) |  |  | 174,695 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 59,890 |  |  |  | 3 |  |  |  | (129 | ) |  |  | 59,764 |
Municipal and pre-refunded municipal bonds |  |  | 53,134 |  |  |  | 17 |  |  |  | (46 | ) |  |  | 53,105 |
Mutual funds, held in rabbi trust |  |  | 10,827 |  |  |  | 20 |  |  |  | (54 | ) |  |  | 10,793 |
|  |  | 123,851 |  |  |  | 40 |  |  |  | (229 | ) |  |  | 123,662 |
|  | $ | 298,635 |  |  | $ | 52 |  |  | $ | (330 | ) |  | $ | 298,357 |
As of October 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |
|  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 30 |  |  |  | — |  |  |  | — |  |  |  | 30 |
Municipal and pre-refunded municipal bonds |  |  | 53 |  |  |  | 1 |  |  |  | — |  |  |  | 54 |
Mutual funds, held in rabbi trust |  |  | 9,393 |  |  |  | 17 |  |  |  | (144 | ) |  |  | 9,266 |
|  |  | 9,476 |  |  |  | 18 |  |  |  | (144 | ) |  |  | 9,350 |
|  | $ | 9,478 |  |  | $ | 18 |  |  | $ | (144 | ) |  | $ | 9,352 |
Proceeds from the sales and maturities of available-for-sale securities were $237,879 and $384,999 for the nine months ended October 31, 2021 and 2020, respectively. The Company initially liquidated its marketable securities portfolio in the nine months ended October 31, 2020, primarily to preserve financial flexibility and maintain liquidity in response to the COVID-19 pandemic, but reinvested in a marketable securities portfolio by January 31, 2021. The Company included in “Other loss, net,” in the Condensed Consolidated Statements of Operations, a net realized gain of $9 and $13 for the three and nine months ended October 31, 2021, respectively, and a net realized gain of $1 and a net realized loss of $419 for the three and nine months ended October 31, 2020, respectively. Amortization of discounts and premiums, net, resulted in a reduction of “Other loss, net” of $1,804 and $4,540 for the three and nine months ended October 31, 2021, respectively, and $201 and $818 for the three and nine months ended October 31, 2020, respectively. 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 loss, net” in the Condensed Consolidated Statements of Operations.

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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 http://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 http://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 http://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 http://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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