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Investments (Tables) | 6 Months Ended
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Jul. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Summary of Debt Securities | As of July 31, 2019, debt securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
U.S. treasury securities | $ | 524,462 |  |  | $ | 554 |  |  | $ | (31 | ) |  | $ | 524,985 |
U.S. agency obligations | 240,029 |  |  | 229 |  |  | (40 | ) |  | 240,218 |
Corporate bonds | 438,825 |  |  | 1,232 |  |  | (134 | ) |  | 439,923 |
Commercial paper | 182,886 |  |  | — |  |  | — |  |  | 182,886 |
| $ | 1,386,202 |  |  | $ | 2,015 |  |  | $ | (205 | ) |  | $ | 1,388,012 |
Included in cash and cash equivalents | $ | 81,003 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 81,006 |
Included in marketable securities | $ | 1,305,199 |  |  | $ | 2,012 |  |  | $ | (205 | ) |  | $ | 1,307,006 |
As of January 31, 2019, debt securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
U.S. treasury securities | $ | 396,347 |  |  | $ | 61 |  |  | $ | (178 | ) |  | $ | 396,230 |
U.S. agency obligations | 241,914 |  |  | 73 |  |  | (151 | ) |  | 241,836 |
Corporate bonds | 419,784 |  |  | 336 |  |  | (352 | ) |  | 419,768 |
Commercial paper | 254,175 |  |  | — |  |  | (2 | ) |  | 254,173 |
| $ | 1,312,220 |  |  | $ | 470 |  |  | $ | (683 | ) |  | $ | 1,312,007 |
Included in cash and cash equivalents | $ | 216,270 |  |  | $ | — |  |  | $ | — |  |  | $ | 216,270 |
Included in marketable securities | $ | 1,095,950 |  |  | $ | 470 |  |  | $ | (683 | ) |  | $ | 1,095,737 |
Equity Investments | Equity investments consisted of the following (in thousands):
| Condensed Consolidated Balance Sheets Location |  | July 31, 2019 |  | January 31, 2019
Money market funds (1) | Cash and cash equivalents |  | $ | 348,109 |  |  | $ | 237,071 |
Marketable equity investments (1) | Marketable securities |  | — |  |  | 44,127 |
Non-marketable equity investments (2) | Other assets |  | 47,060 |  |  | 36,925 |
|  |  | $ | 395,169 |  |  | $ | 318,123 |
(1) | Investments with readily determinable fair values.
(2) Investments in privately held companies without readily determinable fair values.

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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 investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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