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Employee Incentive Plans - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 17, 2017
USD ($)
shares
Mar. 31, 2017
offering_period
Feb. 28, 2017
USD ($)
shares
Oct. 31, 2018
USD ($)
$ / shares
shares
Oct. 31, 2017
USD ($)
$ / shares
shares
Oct. 31, 2018
USD ($)
incentive_plan
$ / shares
shares
Oct. 31, 2017
USD ($)
$ / shares
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       19,314,334   19,314,334   24,917,045
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares         $ 12.27 $ 17.21 $ 5.37  
Grant date fair value of vested stock options       $ 4,800 $ 5,900 $ 18,200 $ 18,900  
Intrinsic value of options exercised       70,200 $ 139,400 225,300 158,700  
Unrecognized stock-based compensation expense related to stock options       $ 43,400   $ 43,400    
Number of options, granted (in shares) | shares       0   684,500    
Issuance of common stock under employee stock purchase plan           $ 6,700    
General and administrative expense recognized           $ 1,008 $ 708 [1]  
Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average stock-based compensation recognition period           3 years 3 months 10 days    
Unrecognized compensation costs related to unvested restricted stock units       $ 189,100   $ 189,100    
Granted during period (in shares) | shares           3,133,189    
Vested during period (in shares) | shares           741,253    
Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average stock-based compensation recognition period           2 years 1 month 5 days    
ESPP                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average stock-based compensation recognition period           6 months    
Unrecognized compensation costs related to unvested restricted stock units       $ 3,700   $ 3,700    
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) | shares       434,640   434,640    
Weighted average price, shares issued under ESPP (in usd per share) | $ / shares       $ 15.31   $ 15.31    
Stormpath Inc.                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Pre-combination service consideration $ 3,700              
Stormpath Inc. | Restricted common stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted during period (in shares) | shares 800,000   800,000          
Shares issued fair value $ 8,600   $ 8,600          
Stormpath Inc. | Restricted stock awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average stock-based compensation recognition period           3 months 15 days    
Unrecognized compensation costs related to unvested restricted stock units       $ 600   $ 600    
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     2,100 1,200   $ 1,200    
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]                
Weighted average stock-based compensation recognition period           9 months 15 days    
Unrecognized compensation costs related to unvested restricted stock units     $ 5,500 $ 1,000   $ 1,000    
Granted during period (in shares) | shares     598,500          
Shares issued fair value     $ 6,600          
Vested during period (in shares) | shares           210,850    
Stormpath Inc. | Stormpath Workforce | Restricted stock awards | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation vesting period     2 years          
Stormpath Inc. | Stormpath Workforce | Restricted stock awards | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation vesting period     3 years          
Stormpath Inc. | Stormpath Workforce | Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average stock-based compensation recognition period           1 year 8 months 12 days    
Shares issued fair value     $ 2,500          
Stock-based compensation vesting period     4 years          
Number of options, granted (in shares) | shares     518,900          
Class A Common Stock | Contribution of Nonmonetary Assets to Charitable Organization                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued as charitable contribution (in shares) | shares       0 24,287 20,000 24,287  
General and administrative expense recognized         $ 700 $ 1,000 $ 700  
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       18,451,057   18,451,057    
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       863,277   863,277    
[1] See Note 2 for a summary of adjustments.