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Employee Incentive Plans - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 17, 2017
USD ($)
shares
Mar. 31, 2017
offering_period
shares
Apr. 30, 2017
USD ($)
equity_incentive_plan
$ / shares
shares
Apr. 30, 2016
USD ($)
$ / shares
Jan. 31, 2017
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of equity incentive plans | equity_incentive_plan     2    
Options to purchase common stock outstanding (in shares) | shares     33,939,472   32,866,862
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares     $ 5.36 $ 3.65  
Grant date fair value of vested stock options     $ 4.6 $ 2.7  
Intrinsic value of options exercised     14.1 $ 0.3  
Unrecognized stock-based compensation expense     $ 75.2    
Number of options, granted (in shares) | shares     2,596,568    
Class B Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares subject to early exercise, liability recorded in accrued expenses and other current liabilities     $ 2.1   $ 2.2
Number of options subject to early exercise (in shares) | shares     438,877   467,180
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average stock-based compensation recognition period     10 months 24 days    
Granted during period (in shares) | shares     58,825    
Unrecognized compensation costs related to unvested restricted stock units     $ 1.0    
Shares issued fair value     $ 1.0    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average stock-based compensation recognition period     3 years 1 month 6 days    
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs related to unvested restricted stock units     $ 10.4    
Shares authorized (in shares) | shares   3,000,000      
ESPP offering period   12 months      
Number of offering periods | offering_period   2      
Employee share purchase price percentage     85.00%    
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        
Stock-based compensation vesting period 2 years        
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     1 year 9 months 18 days    
Unrecognized compensation costs related to unvested restricted stock units     $ 7.4    
Stormpath Inc. | Stormpath Workforce          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Pre-combination service consideration 1.5        
Shares issued fair value $ 9.1        
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     2 years 8 months 12 days    
Granted during period (in shares) | shares 598,500        
Unrecognized compensation costs related to unvested restricted stock units $ 5.5   $ 4.8    
Shares issued fair value 6.6        
Stormpath Inc. | Stormpath Workforce | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense $ 2.1   $ 2.0    
Weighted average stock-based compensation recognition period     3 years 9 months 18 days    
Number of options, granted (in shares) | shares 518,900        
Stock-based compensation vesting period 4 years        
Shares issued fair value $ 2.5        
Minimum | 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 2 years        
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]          
Weighted average stock-based compensation recognition period 3 years        
Stock-based compensation vesting period 3 years