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Employee Incentive Plans Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 17, 2017
USD ($)
Mar. 31, 2017
offering_period
shares
Feb. 28, 2017
USD ($)
shares
Jan. 31, 2020
USD ($)
incentive_plan
$ / shares
shares
Jan. 31, 2019
USD ($)
$ / shares
shares
Jan. 31, 2018
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of equity incentive plans | incentive_plan       2    
Options to purchase common stock outstanding (in shares)       12,359,302 17,803,794  
Weighted average grant date fair value of options granted (in usd per share) | $ / shares       $ 37.35 $ 17.21 $ 5.40
Grant date fair value of vested stock options | $       $ 23,700 $ 23,800 $ 23,900
Intrinsic value of options exercised | $       558,600 309,300 204,800
Unrecognized stock-based compensation expense | $       $ 28,200 37,300  
Number of options, granted (in shares)       415,547    
Issuance of common stock under employee stock purchase plan | $       $ 18,767 $ 13,727 $ 8,369
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average stock-based compensation recognition period       2 years 8 months 12 days    
Granted during period (in shares)       2,458,095    
Shares issued fair value | $       $ 280,400    
Unrecognized compensation costs related to unvested restricted stock units | $       $ 335,900    
Vested during period (in shares)       1,752,333    
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period (years)       10 years    
Vesting period       4 years    
Weighted average stock-based compensation recognition period       1 year 4 months 24 days 1 year 10 months 24 days  
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, reserved for future issuance (in shares)       3,653,857    
Weighted average stock-based compensation recognition period       7 months 6 days    
Unrecognized compensation costs related to unvested restricted stock units | $       $ 8,800    
Shares authorized (in shares)   3,000,000        
ESPP offering period   12 months        
Number of offering periods | offering_period   2        
ESPP length of purchase period   6 months        
Shares issued under ESPP (in shares)       322,795 615,210  
Weighted average price, shares issued under ESPP (in usd per share) | $ / shares       $ 58.14 $ 22.31  
Options and unvested RSUs outstanding            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, reserved for future issuance (in shares)       16,456,003    
Stormpath Inc. | Restricted common stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 2 years          
Granted during period (in shares)     800,000      
Shares issued fair value | $     $ 8,600      
Stormpath Inc. | Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested during period (in shares)       400,000    
Stormpath Inc. | Stormpath Workforce            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense | $     2,100      
Shares issued fair value | $ $ 9,100          
Pre-combination service consideration | $ $ 1,500          
Stormpath Inc. | Stormpath Workforce | Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation costs related to unvested restricted stock units | $     $ 5,500      
Vested during period (in shares)       210,850    
Stormpath Inc. | Stormpath Workforce | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years      
Shares issued fair value | $     $ 2,500      
Number of options, granted (in shares)     518,900      
Minimum | Stormpath Inc. | Stormpath Workforce | Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     2 years      
Expense recognition period       2 years    
Maximum | Stormpath Inc. | Stormpath Workforce | Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     3 years      
Expense recognition period       3 years    
2009 Stock Plan | Stormpath Inc. | Stormpath Workforce | Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted during period (in shares)     598,500      
Shares issued fair value | $     $ 6,600      
2017 Equity Incentive Plan | Class B Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options to purchase common stock outstanding (in shares)       11,348,049    
2017 Equity Incentive Plan | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options to purchase common stock outstanding (in shares)       1,011,253    
Vesting Tranche One | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       1 year    
Vesting percentage earned by employees after each completed year of service       25.00%