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Summary of Significant Accounting Policies Narrative (Details) - USD ($)
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Sep. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Other Accrued Liabilities   $ 14,800,000    
Share Price $ 128.05      
Payment terms for deferred revenue 30 days      
Amortization period for capitalized contract costs 5 years      
Commissions capitalized as contract costs $ 61,300,000 41,300,000    
Amortization of contract costs 28,600,000 20,900,000 $ 15,200,000  
Impairment loss related to costs capitalized 0 0    
Noncurrent portion of restricted cash 11,400,000      
Advertising expenses 17,000,000.0 10,000,000.0 $ 9,400,000  
Operating lease right-of-use assets 125,204,000 $ 121,389,000 [1]    
Operating lease liability $ 166,575,000      
ESPP        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Expected dividend yield 0.00% 0.00% 0.00%  
Capitalized internal-use software costs        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Intangible asset, useful life 3 years      
Minimum        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contract duration 1 year      
Maximum        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contract duration 5 years      
Senior Notes | Convertible Senior Notes Due 2025        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Aggregate principal amount $ 1,060,000,000.0      
Fixed interest rate       0.125%
[1] Adjusted for adoption of ASC 842. See Note 2.