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Employee Incentive Plans - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Feb. 17, 2017
USD ($)
shares
Feb. 28, 2017
USD ($)
shares
Apr. 30, 2018
USD ($)
incentive_plan
$ / shares
shares
Apr. 30, 2017
USD ($)
$ / shares
Jan. 31, 2018
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) | shares     22,675,493   24,917,045
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares     $ 17.21 $ 5.36  
Grant date fair value of vested stock options     $ 5.6 $ 4.6  
Intrinsic value of options exercised     81.9 $ 14.1  
Unrecognized stock-based compensation expense related to stock options     $ 58.0    
Number of options, granted (in shares) | shares     684,500    
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average stock-based compensation recognition period     3 years 4 months 24 days    
Unrecognized compensation costs related to unvested restricted stock units     $ 81.8    
Granted during period (in shares) | shares     717,630    
Vested during period (in shares) | shares     58,825    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average stock-based compensation recognition period     2 years 5 months 19 days    
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average stock-based compensation recognition period     2 months 12 days    
Unrecognized compensation costs related to unvested restricted stock units     $ 1.5    
Stormpath Inc.          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Pre-combination service consideration $ 3.7        
Stormpath Inc. | Restricted common stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted during period (in shares) | shares 800,000        
Shares issued fair value $ 8.6        
Stormpath Inc. | Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average stock-based compensation recognition period     9 months 18 days    
Unrecognized compensation costs related to unvested restricted stock units     $ 1.7    
Vested during period (in shares) | shares     400,000    
Stormpath Inc. | Stormpath Workforce          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense related to stock options   $ 2.1 $ 1.5    
Shares issued fair value 9.1        
Pre-combination service consideration $ 1.5        
Stormpath Inc. | Stormpath Workforce | Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average stock-based compensation recognition period     1 year 3 months 18 days    
Unrecognized compensation costs related to unvested restricted stock units   5.5 $ 1.8    
Granted during period (in shares) | shares     598,500    
Shares issued fair value   6.6      
Vested during period (in shares) | shares     210,850    
Stormpath Inc. | Stormpath Workforce | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average stock-based compensation recognition period     2 years 2 months 12 days    
Shares issued fair value   $ 2.5      
Stock-based compensation vesting period   4 years      
Number of options, granted (in shares) | shares   518,900      
Minimum | Stormpath Inc. | Stormpath Workforce | Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation vesting period   2 years      
Maximum | Stormpath Inc. | Stormpath Workforce | Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation vesting period   3 years      
2009 Stock Plan | Class B Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options to purchase common stock outstanding (in shares) | shares     21,910,897    
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) | shares     764,596