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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