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Investments (Tables) | 3 Months Ended
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Apr. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Summary of Marketable Securities | At April 30, 2018, marketable securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
U.S. agency obligations | $ | 553,880 |  |  | $ | — |  |  | $ | (1,002 | ) |  | $ | 552,878 |
U.S. treasury securities | 1,391,222 |  |  | 7 |  |  | (1,428 | ) |  | 1,389,801 |
Corporate bonds | 420,352 |  |  | 19 |  |  | (1,527 | ) |  | 418,844 |
Commercial paper | 760,993 |  |  | — |  |  | (9 | ) |  | 760,984 |
| $ | 3,126,447 |  |  | $ | 26 |  |  | $ | (3,966 | ) |  | $ | 3,122,507 |
Included in cash and cash equivalents | $ | 792,889 |  |  | $ | 4 |  |  | $ | (9 | ) |  | $ | 792,884 |
Included in marketable securities | $ | 2,333,558 |  |  | $ | 22 |  |  | $ | (3,957 | ) |  | $ | 2,329,623 |
At January 31, 2018, marketable securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
U.S. agency obligations | $ | 683,551 |  |  | $ | — |  |  | $ | (1,127 | ) |  | $ | 682,424 |
U.S. treasury securities | 797,977 |  |  | — |  |  | (1,142 | ) |  | 796,835 |
Corporate bonds | 470,259 |  |  | 16 |  |  | (1,154 | ) |  | 469,121 |
Commercial paper | 602,727 |  |  | — |  |  | — |  |  | 602,727 |
| $ | 2,554,514 |  |  | $ | 16 |  |  | $ | (3,423 | ) |  | $ | 2,551,107 |
Included in cash and cash equivalents | $ | 417,613 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 417,612 |
Included in marketable securities | $ | 2,136,901 |  |  | $ | 16 |  |  | $ | (3,422 | ) |  | $ | 2,133,495 |
Equity Investments | Equity investments consisted of the following (in thousands):
| April 30, 2018 |  | January 31, 2018
Marketable equity investments | $ | 88,571 |  |  | $ | 551,804 |
Non-marketable equity investments | 29,405 |  |  | 28,005 |
| $ | 117,976 |  |  | $ | 579,809 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition [Table Text Block]Equity Securities without Readily Determinable Fair Value And Marketable Equity Investments [Table] + References No definition available. + Details
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