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Marketable Securities | 9 Months Ended
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Oct. 31, 2020
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, 2020, January 31, 2020 and October 31, 2019 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of October 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |
|  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds, held in rabbi trust |  |  | 9,393 |  |  |  | 17 |  |  |  | (144 | ) |  |  | 9,266 |
Municipal and pre-refunded municipal bonds |  |  | 53 |  |  |  | 1 |  |  |  | — |  |  |  | 54 |
Corporate bonds |  |  | 30 |  |  |  | — |  |  |  | — |  |  |  | 30 |
|  |  | 9,476 |  |  |  | 18 |  |  |  | (144 | ) |  |  | 9,350 |
|  | $ | 9,478 |  |  | $ | 18 |  |  | $ | (144 | ) |  | $ | 9,352 |
As of January 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 38,617 |  |  | $ | 20 |  |  | $ | (11 | ) |  | $ | 38,626 |
Corporate bonds |  |  | 166,790 |  |  |  | 318 |  |  |  | (26 | ) |  |  | 167,082 |
Certificates of deposit |  |  | 2,593 |  |  |  | — |  |  |  | — |  |  |  | 2,593 |
Federal government agencies |  |  | 1,152 |  |  |  | 3 |  |  |  | — |  |  |  | 1,155 |
Commercial paper |  |  | 1,997 |  |  |  | — |  |  |  | — |  |  |  | 1,997 |
|  |  | 211,149 |  |  |  | 341 |  |  |  | (37 | ) |  |  | 211,453 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds, held in rabbi trust |  |  | 8,448 |  |  |  | 36 |  |  |  | (55 | ) |  |  | 8,429 |
Municipal and pre-refunded municipal bonds |  |  | 30,340 |  |  |  | 35 |  |  |  | (17 | ) |  |  | 30,358 |
Corporate bonds |  |  | 47,352 |  |  |  | 205 |  |  |  | (40 | ) |  |  | 47,517 |
Certificates of deposit |  |  | 3,867 |  |  |  | — |  |  |  | — |  |  |  | 3,867 |
Federal government agencies |  |  | 6,926 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 6,925 |
|  |  | 96,933 |  |  |  | 277 |  |  |  | (114 | ) |  |  | 97,096 |
|  | $ | 308,082 |  |  | $ | 618 |  |  | $ | (151 | ) |  | $ | 308,549 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of October 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal and pre-refunded municipal bonds |  | $ | 39,256 |  |  | $ | 38 |  |  | $ | (14 | ) |  | $ | 39,280 |
Corporate bonds |  |  | 125,040 |  |  |  | 310 |  |  |  | (12 | ) |  |  | 125,338 |
Federal government agencies |  |  | 1,622 |  |  |  | 4 |  |  |  | — |  |  |  | 1,626 |
Certificates of deposit |  |  | 2,466 |  |  |  | — |  |  |  | — |  |  |  | 2,466 |
Commercial paper |  |  | 1,987 |  |  |  | — |  |  |  | — |  |  |  | 1,987 |
|  |  | 170,371 |  |  |  | 352 |  |  |  | (26 | ) |  |  | 170,697 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds, held in rabbi trust |  |  | 7,661 |  |  |  | 144 |  |  |  | (1 | ) |  |  | 7,804 |
Municipal and pre-refunded municipal bonds |  |  | 20,795 |  |  |  | 13 |  |  |  | (35 | ) |  |  | 20,773 |
Corporate bonds |  |  | 45,556 |  |  |  | 270 |  |  |  | (26 | ) |  |  | 45,800 |
Federal government agencies |  |  | 6,365 |  |  |  | — |  |  |  | (15 | ) |  |  | 6,350 |
Certificates of deposit |  |  | 2,394 |  |  |  | — |  |  |  | — |  |  |  | 2,394 |
|  |  | 82,771 |  |  |  | 427 |  |  |  | (77 | ) |  |  | 83,121 |
|  | $ | 253,142 |  |  | $ | 779 |  |  | $ | (103 | ) |  | $ | 253,818 |
Proceeds from the sales and maturities of available-for-sale securities were $384,999 and $382,629 for the nine months ended October 31, 2020 and 2019, respectively. Net liquidations of the Company’s marketable securities portfolio in the nine months ended October 31, 2020 were primarily to preserve financial flexibility and maintain liquidity in response to the coronavirus pandemic. The Company included in “Other (loss) income, net,” in the Condensed Consolidated Statements of Operations, a net realized gain of $1 and a net realized loss of $419 for the three and nine months ended October 31, 2020, respectively, and net realized gains of $6 and $32 for the three and nine months ended October 31, 2019, respectively. Amortization of discounts and premiums, net, resulted in a reduction of “Other (loss) income, net” of $201 and $818 for the three and nine months ended October 31, 2020, respectively, and $156 and $427 for the three and nine months ended October 31, 2019, 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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