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Net Loss Per Share - Summary of Diluted Net Loss Per Common Share (Detail) - shares shares in Thousands | 3 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Total anti-dilutive securities (in shares) | 51,754 | 38,678
Outstanding common stock options |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Total anti-dilutive securities (in shares) | 6,079 | 8,468
Shares subject to repurchase |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Total anti-dilutive securities (in shares) | 0 | 70
Unvested restricted stock awards, units, and PRSUs |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Total anti-dilutive securities (in shares) | 15,051 | 15,133
Shares related to the convertible senior notes |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Total anti-dilutive securities (in shares) | 15,079 | 7,261
Shares subject to warrants related to the issuance of convertible senior notes |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Total anti-dilutive securities (in shares) | 15,079 | 7,261
Shares issuable pursuant to the ESPP |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Total anti-dilutive securities (in shares) | 466 | 485

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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