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Marketable Securities (Tables) | 12 Months Ended
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Jan. 31, 2019
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 values of available-for-sale securities by major security type and class of security as of January 31, 2019 and 2018 are as follows:
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized (Losses) |  |  | Fair Value |
As of January 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 227,287 |  |  | $ | 24 |  |  | $ | (214 | ) |  | $ | 227,097 |
Municipal and pre-refunded municipal bonds |  |  | 43,677 |  |  |  | 15 |  |  |  | (18 | ) |  |  | 43,674 |
Federal government agencies |  |  | 1,458 |  |  |  | — |  |  |  | — |  |  |  | 1,458 |
Certificate of deposit |  |  | 1,050 |  |  |  | — |  |  |  | — |  |  |  | 1,050 |
Commercial paper |  |  | 2,979 |  |  |  | — |  |  |  | — |  |  |  | 2,979 |
Treasury bills |  |  | 2,975 |  |  |  | — |  |  |  | (1 | ) |  |  | 2,974 |
|  |  | 279,426 |  |  |  | 39 |  |  |  | (233 | ) |  |  | 279,232 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 34,265 |  |  |  | 34 |  |  |  | (63 | ) |  |  | 34,236 |
Municipal and pre-refunded municipal bonds |  |  | 7,554 |  |  |  | 7 |  |  |  | (3 | ) |  |  | 7,558 |
Federal government agencies |  |  | 6,603 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 6,604 |
Mutual funds, held in rabbi trust |  |  | 6,301 |  |  |  | 450 |  |  |  | — |  |  |  | 6,751 |
Certificates of deposit |  |  | 2,143 |  |  |  | — |  |  |  | — |  |  |  | 2,143 |
|  |  | 56,866 |  |  |  | 493 |  |  |  | (67 | ) |  |  | 57,292 |
|  | $ | 336,292 |  |  | $ | 532 |  |  | $ | (300 | ) |  | $ | 336,524 |
As of January 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 111,612 |  |  | $ | — |  |  | $ | (184 | ) |  | $ | 111,428 |
Municipal and pre-refunded municipal bonds |  |  | 52,474 |  |  |  | 11 |  |  |  | (39 | ) |  |  | 52,446 |
Certificates of deposit |  |  | 1,251 |  |  |  | — |  |  |  | — |  |  |  | 1,251 |
|  |  | 165,337 |  |  |  | 11 |  |  |  | (223 | ) |  |  | 165,125 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 39,853 |  |  |  | — |  |  |  | (228 | ) |  |  | 39,625 |
Municipal and pre-refunded municipal bonds |  |  | 9,873 |  |  |  | 8 |  |  |  | (24 | ) |  |  | 9,857 |
Mutual funds, held in rabbi trust |  |  | 5,973 |  |  |  | 274 |  |  |  | (10 | ) |  |  | 6,237 |
Certificates of deposit |  |  | 2,969 |  |  |  | — |  |  |  | — |  |  |  | 2,969 |
|  |  | 58,668 |  |  |  | 282 |  |  |  | (262 | ) |  |  | 58,688 |
|  | $ | 224,005 |  |  | $ | 293 |  |  | $ | (485 | ) |  | $ | 223,813 |
Gross Unrealized Losses and Fair Value of Marketable Securities | The following tables show the gross unrealized losses and fair value of the Company’s marketable securities with unrealized losses that are not deemed to be other-than-temporarily impaired aggregated by the length of time that individual securities have been in a continuous unrealized loss position, at January 31, 2019 and 2018, respectively.
| January 31, 2019 |
| Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
Description of Securities | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
Corporate bonds | $ | 177,932 |  |  | $ | (160 | ) |  | $ | 38,201 |  |  | $ | (117 | ) |  | $ | 216,133 |  |  | $ | (277 | )
Municipal and pre-refunded municipal bonds |  | 20,732 |  |  |  | (13 | ) |  |  | 4,907 |  |  |  | (8 | ) |  |  | 25,639 |  |  |  | (21 | )
Federal government agencies |  | 3,315 |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | 3,315 |  |  |  | (1 | )
Treasury bills |  | 2,974 |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | 2,974 |  |  |  | (1 | )
Total | $ | 204,953 |  |  | $ | (175 | ) |  | $ | 43,108 |  |  | $ | (125 | ) |  | $ | 248,061 |  |  | $ | (300 | )
| January 31, 2018 |
| Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
Description of Securities | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
Corporate bonds | $ | 151,053 |  |  | $ | (412 | ) |  | $ | — |  |  | $ | — |  |  | $ | 151,053 |  |  | $ | (412 | )
Municipal and pre-refunded municipal bonds |  | 39,671 |  |  |  | (63 | ) |  |  | — |  |  |  | — |  |  |  | 39,671 |  |  |  | (63 | )
Mutual funds, held in rabbi trust |  | 474 |  |  |  | (10 | ) |  |  | — |  |  |  | — |  |  |  | 474 |  |  |  | (10 | )
Total | $ | 191,198 |  |  | $ | (485 | ) |  | $ | — |  |  | $ | — |  |  | $ | 191,198 |  |  | $ | (485 | )

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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