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Marketable Securities | 3 Months Ended
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Apr. 30, 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 April 30, 2021, January 31, 2021 and April 30, 2020 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of April 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 106,266 |  |  | $ | 5 |  |  | $ | (84 | ) |  | $ | 106,187 |
Corporate bonds |  |  | 48,500 |  |  |  | 1 |  |  |  | (49 | ) |  |  | 48,452 |
Commercial paper |  |  | 9,791 |  |  |  | — |  |  |  | — |  |  |  | 9,791 |
|  |  | 164,557 |  |  |  | 6 |  |  |  | (133 | ) |  |  | 164,430 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  |  | 40,085 |  |  |  | 17 |  |  |  | (48 | ) |  | $ | 40,054 |
Corporate bonds |  |  | 48,850 |  |  |  | 2 |  |  |  | (111 | ) |  |  | 48,741 |
Mutual funds, held in rabbi trust |  |  | 11,448 |  |  |  | 437 |  |  |  | — |  |  |  | 11,885 |
|  |  | 100,383 |  |  |  | 456 |  |  |  | (159 | ) |  |  | 100,680 |
|  | $ | 264,940 |  |  | $ | 462 |  |  | $ | (292 | ) |  | $ | 265,110 |
As of January 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 127,097 |  |  | $ | 11 |  |  | $ | (53 | ) |  | $ | 127,055 |
Corporate bonds |  |  | 38,695 |  |  |  | 1 |  |  |  | (48 | ) |  |  | 38,648 |
Commercial paper |  |  | 8,992 |  |  |  | — |  |  |  | — |  |  |  | 8,992 |
|  |  | 174,784 |  |  |  | 12 |  |  |  | (101 | ) |  |  | 174,695 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  |  | 53,134 |  |  |  | 17 |  |  |  | (46 | ) |  |  | 53,105 |
Corporate bonds |  |  | 59,890 |  |  |  | 3 |  |  |  | (129 | ) |  |  | 59,764 |
Mutual funds, held in rabbi trust |  |  | 10,827 |  |  |  | 20 |  |  |  | (54 | ) |  |  | 10,793 |
|  |  | 123,851 |  |  |  | 40 |  |  |  | (229 | ) |  |  | 123,662 |
|  | $ | 298,635 |  |  | $ | 52 |  |  | $ | (330 | ) |  | $ | 298,357 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of April 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 50,887 |  |  | $ | 5 |  |  | $ | (31 | ) |  | $ | 50,861 |
Corporate bonds |  |  | 14,246 |  |  |  | 21 |  |  |  | (7 | ) |  |  | 14,260 |
|  |  | 65,133 |  |  |  | 26 |  |  |  | (38 | ) |  |  | 65,121 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  |  | 2,350 |  |  |  | 21 |  |  |  | (1 | ) |  |  | 2,370 |
Corporate bonds |  |  | 2,572 |  |  |  | 3 |  |  |  | (4 | ) |  |  | 2,571 |
Mutual funds, held in rabbi trust |  |  | 7,400 |  |  |  | 682 |  |  |  | — |  |  |  | 8,082 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
|  |  | 12,571 |  |  |  | 706 |  |  |  | (5 | ) |  |  | 13,272 |
|  | $ | 77,704 |  |  | $ | 732 |  |  | $ | (43 | ) |  | $ | 78,393 |
Proceeds from the sales and maturities of available-for-sale securities were $73,848 and $311,258 for the three months ended April 30, 2021 and 2020, respectively. The Company initially liquidated its marketable securities portfolio in the three months ended April 30, 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) income, net,” in the Condensed Consolidated Statements of Operations, a net realized loss of $0 and $454 for the three months ended April 30, 2021 and 2020, respectively. Amortization of discounts and premiums, net, resulted in a reduction of “Other (loss) income, net” of $1,338 and $409 for the three months ended April 30, 2021 and 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) income, 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 + Details
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