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Fair Value Measurements (Tables) | 3 Months Ended
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Apr. 30, 2019
Fair Value Disclosures [Abstract] |
Summary of assets and liabilities measured at fair value on a recurring basis | The following table summarizes our financial assets that are measured at fair value on a recurring basis during the period:
| April 30, 2019
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Level 1: |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 91,330 |  |  | $ | — |  |  | $ | — |  |  | $ | 91,330 |
Level 2: |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Commercial paper | 4,998 |  |  | — |  |  | — |  |  | 4,998 |
Available-for-sale securities |  |  |  |  |  |  |
Commercial paper | 62,695 |  |  | 31 |  |  | (8 | ) |  | 62,718 |
Corporate notes and bonds | 334,912 |  |  | 582 |  |  | (34 | ) |  | 335,460 |
U.S. Treasury securities | 232,152 |  |  | 32 |  |  | (15 | ) |  | 232,169 |
U.S. government agency securities | 69,977 |  |  | 12 |  |  | (5 | ) |  | 69,984 |
Level 2 total | 704,734 |  |  | 657 |  |  | (62 | ) |  | 705,329 |
Total | $ | 796,064 |  |  | $ | 657 |  |  | $ | (62 | ) |  | $ | 796,659 |
| January 31, 2019
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Level 1: |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 350,063 |  |  | $ | — |  |  | $ | — |  |  | $ | 350,063 |
Level 2: |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |
Commercial paper | 76,828 |  |  | — |  |  | (11 | ) |  | 76,817 |
Corporate notes and bonds | 2,998 |  |  | — |  |  | — |  |  | 2,998 |
U.S. government agency securities | 6,491 |  |  | — |  |  | — |  |  | 6,491 |
Available-for-sale securities |  |  |  |  |  |  |
Commercial paper | 86,655 |  |  | 4 |  |  | (21 | ) |  | 86,638 |
Corporate notes and bonds | 287,496 |  |  | 389 |  |  | (105 | ) |  | 287,780 |
U.S. Treasury securities | 4,982 |  |  | — |  |  | (1 | ) |  | 4,981 |
U.S. government agency securities | 36,021 |  |  | 7 |  |  | (4 | ) |  | 36,024 |
Level 2 total | 501,471 |  |  | 400 |  |  | (142 | ) |  | 501,729 |
Total | $ | 851,534 |  |  | $ | 400 |  |  | $ | (142 | ) |  | $ | 851,792 |
Fair value of available-for-sale marketable securities by remaining contractual maturities | The fair value of our available-for-sale marketable securities as of April 30, 2019, by remaining contractual maturities, were as follows (in thousands):
Due in one year or less | $ | 515,648 |
Due in one to two years | 184,683 |
| $ | 700,331 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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