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Fair Value (Tables) | 12 Months Ended
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Jan. 31, 2019
Fair Value Disclosures [Abstract] |
Financial Assets Measured at Fair Value on Recurring Basis | The Company’s financial assets that are accounted for at fair value on a recurring basis are presented in the tables below:
|  | Marketable Securities Fair Value as of January 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 261,333 |  |  | $ | — |  |  | $ | — |  |  | $ | 261,333 |
Municipal and pre-refunded municipal bonds |  |  | — |  |  |  | 51,232 |  |  |  | — |  |  |  | 51,232 |
Federal government agencies |  |  | 8,062 |  |  |  | — |  |  |  | — |  |  |  | 8,062 |
Mutual funds, held in rabbi trust |  |  | 6,751 |  |  |  | — |  |  |  | — |  |  |  | 6,751 |
Certificates of deposit |  |  | — |  |  |  | 3,193 |  |  |  | — |  |  |  | 3,193 |
Commercial paper |  |  |  |  |  |  | 2,979 |  |  |  | — |  |  |  | 2,979 |
Treasury bills |  |  | 2,974 |  |  |  | — |  |  |  | — |  |  |  | 2,974 |
|  | $ | 279,120 |  |  | $ | 57,404 |  |  | $ | — |  |  | $ | 336,524 |
|  | Marketable Securities Fair Value as of January 31, 2018 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 151,053 |  |  | $ | — |  |  | $ | — |  |  | $ | 151,053 |
Municipal and pre-refunded municipal bonds |  |  | — |  |  |  | 62,303 |  |  |  | — |  |  |  | 62,303 |
Mutual funds, held in rabbi trust |  |  | 6,237 |  |  |  | — |  |  |  | — |  |  |  | 6,237 |
Certificates of deposit |  |  | — |  |  |  | 4,220 |  |  |  | — |  |  |  | 4,220 |
|  | $ | 157,290 |  |  | $ | 66,523 |  |  | $ | — |  |  | $ | 223,813 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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