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Summary of Significant Accounting Policies - Narrative (Details)
12 Months Ended
Jan. 31, 2020
USD ($)
segment
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Feb. 01, 2019
USD ($)
Concentration Risk [Line Items]        
Operating segments | segment 2      
Allowance for doubtful accounts $ 800,000 $ 200,000    
Impairment of property and equipment 0 0 $ 0  
Goodwill impairment 0 0 0  
Impairment of intangible assets 0 0 0  
Contract costs 90,000,000.0 69,000,000.0    
Capitalized contract cost, amortization 47,600,000 30,600,000 23,300,000  
Amortization of deferred costs 47,552,000 30,634,000 23,284,000  
Advertising expense 15,400,000 $ 6,900,000 $ 6,400,000  
Present value of lease liabilities 211,505,000     $ 247,300,000
Operating lease right-of-use assets $ 204,642,000     $ 235,900,000
Restricted stock awards        
Concentration Risk [Line Items]        
Award vesting period (in years) 4 years      
Minimum        
Concentration Risk [Line Items]        
Subscription period 1 year      
Minimum | Restricted stock awards        
Concentration Risk [Line Items]        
Award vesting period (in years) 3 years      
Minimum | Equity Incentive Plan 2008 | Restricted stock awards        
Concentration Risk [Line Items]        
Award vesting period (in years) 3 years      
Maximum        
Concentration Risk [Line Items]        
Subscription period 3 years      
Revenue from contract with customer, subscription period, limited cases 7 years      
Maximum | Restricted stock awards        
Concentration Risk [Line Items]        
Award vesting period (in years) 4 years      
Maximum | Equity Incentive Plan 2008 | Restricted stock awards        
Concentration Risk [Line Items]        
Award vesting period (in years) 4 years