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Marketable Securities | 6 Months Ended
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Jul. 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 July 31, 2020, January 31, 2020 and July 31, 2019 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of July 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 291 |  |  | $ | — |  |  | $ | — |  |  | $ | 291 |
Municipal and pre-refunded municipal bonds |  |  | 210 |  |  |  | — |  |  |  | — |  |  |  | 210 |
|  |  | 501 |  |  |  | — |  |  |  | — |  |  |  | 501 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds, held in rabbi trust |  |  | 8,767 |  |  |  | 365 |  |  |  | — |  |  |  | 9,132 |
Corporate bonds |  |  | 30 |  |  |  | — |  |  |  | — |  |  |  | 30 |
Municipal and pre-refunded municipal bonds |  |  | 53 |  |  |  | 1 |  |  |  | — |  |  |  | 54 |
|  |  | 8,850 |  |  |  | 366 |  |  |  | — |  |  |  | 9,216 |
|  | $ | 9,351 |  |  | $ | 366 |  |  | $ | — |  |  | $ | 9,717 |
As of January 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 166,790 |  |  | $ | 318 |  |  | $ | (26 | ) |  | $ | 167,082 |
Municipal and pre-refunded municipal bonds |  |  | 38,617 |  |  |  | 20 |  |  |  | (11 | ) |  |  | 38,626 |
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 |
Corporate bonds |  |  | 47,352 |  |  |  | 205 |  |  |  | (40 | ) |  |  | 47,517 |
Municipal and pre-refunded municipal bonds |  |  | 30,340 |  |  |  | 35 |  |  |  | (17 | ) |  |  | 30,358 |
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 July 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 125,943 |  |  | $ | 190 |  |  | $ | (31 | ) |  | $ | 126,102 |
Municipal and pre-refunded municipal bonds |  |  | 42,023 |  |  |  | 40 |  |  |  | (9 | ) |  |  | 42,054 |
Certificates of deposit |  |  | 1,745 |  |  |  | — |  |  |  | — |  |  |  | 1,745 |
Federal government agencies |  |  | 1,495 |  |  |  | 2 |  |  |  | — |  |  |  | 1,497 |
|  |  | 171,206 |  |  |  | 232 |  |  |  | (40 | ) |  |  | 171,398 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds, held in rabbi trust |  |  | 7,826 |  |  |  | 56 |  |  |  | (7 | ) |  |  | 7,875 |
Corporate bonds |  |  | 49,385 |  |  |  | 174 |  |  |  | (33 | ) |  |  | 49,526 |
Municipal and pre-refunded municipal bonds |  |  | 19,526 |  |  |  | 6 |  |  |  | (50 | ) |  |  | 19,482 |
Certificates of deposit |  |  | 1,847 |  |  |  | — |  |  |  | — |  |  |  | 1,847 |
Federal government agencies |  |  | 126 |  |  |  | 1 |  |  |  | — |  |  |  | 127 |
|  |  | 78,710 |  |  |  | 237 |  |  |  | (90 | ) |  |  | 78,857 |
|  | $ | 249,916 |  |  | $ | 469 |  |  | $ | (130 | ) |  | $ | 250,255 |
Proceeds from the sales and maturities of available-for-sale securities were $383,056 and $320,411 for the six months ended July 31, 2020 and 2019, respectively. Net liquidations of the Company’s marketable securities portfolio in the six months ended July 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 $34 and a net realized loss of $420 for the three and six months ended July 31, 2020, respectively, and net realized gains of $19 and $26 for the three and six months ended July 31, 2019, respectively. Amortization of discounts and premiums, net, resulted in a reduction of “Other (loss) income, net” of $208 and $617 for the three and six months ended July 31, 2020, respectively, and $152 and $271 for the three and six months ended July 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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