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Marketable Securities | 6 Months Ended
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Jul. 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 July 31, 2021, January 31, 2021 and July 31, 2020 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of July 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 122,173 |  |  | $ | 14 |  |  | $ | (87 | ) |  | $ | 122,100 |
Corporate bonds |  |  | 28,808 |  |  |  | 2 |  |  |  | (24 | ) |  |  | 28,786 |
Commercial paper |  |  | 6,096 |  |  |  | — |  |  |  | — |  |  |  | 6,096 |
|  |  | 157,077 |  |  |  | 16 |  |  |  | (111 | ) |  |  | 156,982 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  |  | 40,069 |  |  |  | 34 |  |  |  | (56 | ) |  | $ | 40,047 |
Corporate bonds |  |  | 61,646 |  |  |  | 4 |  |  |  | (159 | ) |  |  | 61,491 |
Mutual funds, held in rabbi trust |  |  | 11,610 |  |  |  | 143 |  |  |  | (42 | ) |  |  | 11,711 |
|  |  | 113,325 |  |  |  | 181 |  |  |  | (257 | ) |  |  | 113,249 |
|  | $ | 270,402 |  |  | $ | 197 |  |  | $ | (368 | ) |  | $ | 270,231 |
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 July 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 210 |  |  | $ | — |  |  | $ | — |  |  | $ | 210 |
Corporate bonds |  |  | 291 |  |  |  | — |  |  |  | — |  |  |  | 291 |
|  |  | 501 |  |  |  | — |  |  |  | — |  |  |  | 501 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  |  | 53 |  |  |  | 1 |  |  |  | — |  |  |  | 54 |
Corporate bonds |  |  | 30 |  |  |  | — |  |  |  | — |  |  |  | 30 |
Mutual funds, held in rabbi trust |  |  | 8,767 |  |  |  | 365 |  |  |  | — |  |  |  | 9,132 |
|  |  | 8,850 |  |  |  | 366 |  |  |  | — |  |  |  | 9,216 |
|  | $ | 9,351 |  |  | $ | 366 |  |  | $ | — |  |  | $ | 9,717 |
Proceeds from the sales and maturities of available-for-sale securities were $148,582 and $383,056 for the six months ended July 31, 2021 and 2020, respectively. The Company initially liquidated its marketable securities portfolio in the six months ended July 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 $4 for the three and six months ended July 31, 2021, and a net realized gain of $34 and a net realized loss of $420 for the three and six months ended July 31, 2020, respectfully. Amortization of discounts and premiums, net, resulted in a reduction of “Other loss, net” of $1,398 and $2,736 for the three and six months ended July 31, 2021, respectively, and $208 and $617 for the three and six months ended July 31, 2020, respectfully. 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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