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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Jul. 31, 2018 | Jan. 31, 2018
--- | --- | ---
Assets: |  |
Cash equivalents, fair value | $ 167,584 | $ 90,770
Short term investments, fair value | 343,374 | 101,765
Total cash equivalents and short-term investments | 510,958 | 192,535
Level 1 |  |
Assets: |  |
Cash equivalents, fair value | 155,347 | 90,770
Short term investments, fair value | 0 | 0
Total cash equivalents and short-term investments | 155,347 | 90,770
Level 2 |  |
Assets: |  |
Cash equivalents, fair value | 12,237 | 0
Short term investments, fair value | 343,374 | 101,765
Total cash equivalents and short-term investments | 355,611 | 101,765
Level 3 |  |
Assets: |  |
Cash equivalents, fair value | 0 | 0
Short term investments, fair value | 0 | 0
Total cash equivalents and short-term investments | 0 | 0
Commercial paper |  |
Assets: |  |
Short term investments, fair value | 56,191 | 15,946
Commercial paper | Level 1 |  |
Assets: |  |
Short term investments, fair value | 0 | 0
Commercial paper | Level 2 |  |
Assets: |  |
Short term investments, fair value | 56,191 | 15,946
Commercial paper | Level 3 |  |
Assets: |  |
Short term investments, fair value | 0 | 0
U.S. treasury securities |  |
Assets: |  |
Short term investments, fair value | 247,864 | 61,738
U.S. treasury securities | Level 1 |  |
Assets: |  |
Short term investments, fair value | 0 | 0
U.S. treasury securities | Level 2 |  |
Assets: |  |
Short term investments, fair value | 247,864 | 61,738
U.S. treasury securities | Level 3 |  |
Assets: |  |
Short term investments, fair value | 0 | 0
Corporate debt securities |  |
Assets: |  |
Short term investments, fair value | 39,319 | 24,081
Corporate debt securities | Level 1 |  |
Assets: |  |
Short term investments, fair value | 0 | 0
Corporate debt securities | Level 2 |  |
Assets: |  |
Short term investments, fair value | 39,319 | 24,081
Corporate debt securities | Level 3 |  |
Assets: |  |
Short term investments, fair value | 0 | 0
Money market funds |  |
Assets: |  |
Cash equivalents, fair value | 155,347 | 90,770
Money market funds | Level 1 |  |
Assets: |  |
Cash equivalents, fair value | 155,347 | 90,770
Money market funds | Level 2 |  |
Assets: |  |
Cash equivalents, fair value | 0 | 0
Money market funds | Level 3 |  |
Assets: |  |
Cash equivalents, fair value | 0 | $ 0
Commercial paper |  |
Assets: |  |
Cash equivalents, fair value | 12,237 |
Commercial paper | Level 1 |  |
Assets: |  |
Cash equivalents, fair value | 0 |
Commercial paper | Level 2 |  |
Assets: |  |
Cash equivalents, fair value | 12,237 |
Commercial paper | Level 3 |  |
Assets: |  |
Cash equivalents, fair value | $ 0 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: 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(12)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(5)) -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 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e24584-111560 Reference 4: 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(6)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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