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Summary of Significant Accounting Policies - Additional Information (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 01, 2021 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2021 USD ($) Source | Jan. 31, 2020 USD ($) | Jan. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of revenue sources | Source |  |  | 3 |  |
Sales commission estimated period of amortization on straight-line basis |  |  | 5 years |  |
Deferred sales commissions costs |  |  | $ 48,000,000.0 | $ 44,000,000.0 | $ 37,600,000
Amortized deferred commissions |  |  | 36,100,000 | 25,900,000 | 17,300,000
Foreign currency transaction losses |  |  | $ 2,500,000 | 1,100,000 | 0
Cash and cash equivalents liquid investments original maturity period |  |  | 90 days |  |
Impairment adjustment on investments |  |  | $ 0 |  |
Gain on sale of strategic equity investment |  |  |  |  | 2,000,000.0
Goodwill impairment |  |  | 0 |  |
Advertising costs |  |  | $ 15,000,000.0 | 25,600,000 | $ 30,200,000
Measured tax percentage of likelihood realized upon settlement |  |  | 50.00% |  |
Accumulated deficit |  | $ (1,321,679,000) | $ (1,321,679,000) | (1,278,246,000) |
Additional paid-in capital |  | $ 1,474,843,000 | $ 1,474,843,000 | $ 1,302,072,000 |
ASU 2016-13 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  | true | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Feb. 01, 2020 | Feb. 01, 2020 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] |  | true | true |  |
ASU 2020-06 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Feb. 01, 2021 | Feb. 01, 2021 |  |
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false] |  | true | true |  |
ASU 2020-06 | Subsequent Event |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Accumulated deficit | $ (600,000) |  |  |  |
Additional paid-in capital | (68,700,000) |  |  |  |
Increase of debt, net, non current | $ 68,100,000 |  |  |  |
Convertible Seniors Notes Due January 15, 2026 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Aggregate principal amount |  | $ 345,000,000.0 | $ 345,000,000.0 |  |
Debt instrument interest rate stated percentage |  | 0.00% | 0.00% |  |
Debt instrument due date |  | Jan. 15, 2026 |  |  |
Credit Concentration Risk | Accounts Receivable |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of major customers |  |  | one | one |
Concentration risk percentage |  |  | 10.00% | 10.00% |
Customer Concentration Risk | Revenue |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of major customers |  |  | No | One | One
Concentration risk percentage |  |  | 10.00% | 10.00% | 11.00%
Geographic Concentration Risk | Revenue | United States |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 72.00% | 75.00% | 77.00%
Geographic Concentration Risk | Revenue | Japan |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 14.00% | 10.00% |
Geographic Concentration Risk | Property and Equipment | United States |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 96.00% | 94.00% |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives |  |  | 5 years |  |
Period of subscription and premier services contracts |  |  | 3 years |  |
Finite-lived intangible assets estimated useful lives |  |  | 7 years |  |
Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives |  |  | 3 years |  |
Period of subscription and premier services contracts |  |  | 1 year |  |
Finite-lived intangible assets estimated useful lives |  |  | 2 years |  |
Furniture and Fixtures | Service Life |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives |  |  | 5 years |  |
Furniture and Fixtures | Previously Reported | Service Life |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives |  |  | 3 years |  |
Internal-Use Software |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives |  |  | 3 years |  |
Internal-Use Software Costs Include On-Premises Software | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment, estimated useful lives |  |  | 5 years |  |

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