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Marketable Securities (Tables) | 6 Months Ended
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Jul. 31, 2020
Investments Debt And Equity Securities [Abstract] |
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities | 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 |

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