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Summary of Significant Accounting Policies - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 26, 2018 USD ($) | Jan. 31, 2021 USD ($) reporting_unit segment | Jan. 31, 2020 USD ($) | Jan. 31, 2019 USD ($) | Feb. 01, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Advertising expense |  | $ 78,600,000 | $ 41,600,000 | $ 34,100,000 |
Foreign currency transaction gain (loss) |  | 1,900,000 | (1,000,000.0) | (3,400,000) |
Equity investments in privately held companies |  | 6,000,000.0 | 15,500,000 |  |
Unbilled accounts receivable |  | $ 3,600,000 | 1,600,000 |  |
Number of operating segments | segment |  | 1 |  |  |
Number of reporting units | reporting_unit |  | 1 |  |  |
Impairment of goodwill |  |  | 0 | $ 0 |
Number of reportable segments | segment |  | 1 |  |  |
Additional paid in capital |  | $ 1,702,254,000 | 1,685,167,000 |  |
Increase in accumulated deficit |  | $ (1,380,452,000) | $ (1,137,185,000) |  |
Cumulative Effect, Period of Adoption, Adjustment | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Convertible senior notes, carrying value |  |  |  |  | $ 77,000,000
Additional paid in capital |  |  |  |  | (90,000,000)
Increase in accumulated deficit |  |  |  |  | $ 12,000,000
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ESPP offering period | 6 months |  |  |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Accelerated share based compensation expense | $ 262,800,000 |  |  |  |
Initial Acquisition Of Contract |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Commissions paid, amortization period |  | 5 years |  |  |
Renewal Contracts |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Commissions paid, amortization period |  | 2 years |  |  |
Software, including capitalized software development costs | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected useful life |  | 3 years |  |  |
Software, including capitalized software development costs | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected useful life |  | 5 years |  |  |

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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