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Equity Incentive Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Oct. 04, 2018
Oct. 31, 2018
Sep. 30, 2018
Oct. 31, 2017
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested options exercisable (in shares)         352,391    
Weighted-average grant-date fair value of options granted (in dollar per share)         $ 50.92 $ 10.22  
Unrecognized stock-based compensation expense related to unvested stock options         $ 53,800    
Unrecognized over a weighted-average period (in years)         2 years 1 month 20 days    
Stock-based compensation expense         $ 60,007 $ 39,942 $ 12,742
Accrued compensation and benefits         48,409 22,147  
Stock-based compensation expense related to business combinations         3,300 $ 4,400 $ 400
Swiftype              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share capital acquired in business combination (in percentage)       100.00%      
Equity Settled RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized stock-based compensation expense related to unvested stock options         $ 144,300    
Unrecognized over a weighted-average period (in years)         3 years 5 months 1 day    
RSAs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense $ 1,700       $ 200    
Cash Settled RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period         4 years    
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense         $ 28,100    
Number of awards, RSUs granted (in shares)         2,101,271 732,701  
Grant date fair value (in dollars per share)         $ 68.25    
Tranche One | RSAs | Swiftype              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award vesting rights percentage       50.00%      
Tranche One | Cash Settled RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award vesting rights percentage         25.00%    
Share-based compensation arrangement by share-based payment award current year vesting period         1 year    
Stock-based compensation expense   $ 800          
Number of awards, RSUs granted (in shares)         1,388    
Accrued compensation and benefits         $ 3,500    
Tranche Two | RSAs | Swiftype              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period       1 year      
Share-based compensation arrangement by share-based payment award vesting rights percentage       25.00%      
Tranche Two | Cash Settled RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award remainder of quarterly vesting period (in years)         36 months    
Tranche Three | RSAs | Swiftype              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period       2 years      
Share-based compensation arrangement by share-based payment award vesting rights percentage       25.00%      
Tranche Four | RSAs | Swiftype              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period       1 year      
Share-based compensation arrangement by share-based payment award vesting rights percentage       50.00%      
Tranche Five | RSAs | Swiftype              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period       2 years      
Share-based compensation arrangement by share-based payment award vesting rights percentage       50.00%      
2012 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award expiration period     10 years        
2012 Plan | New Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period     4 years        
2012 Plan | Existing Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period     4 years        
2012 Plan | Equity Settled RSUs | New Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period     4 years        
2012 Plan | Equity Settled RSUs | Existing Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period     4 years        
2012 Plan | RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of awards, RSUs granted (in shares)         2,101,271 732,701  
Grant date fair value (in dollars per share)         $ 68.25 $ 64.55  
2012 Plan | Tranche One | New Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period     1 year        
Share-based compensation arrangement by share-based payment award vesting rights percentage     25.00%        
2012 Plan | Tranche One | Equity Settled RSUs | New Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award vesting rights percentage     25.00%        
Share-based compensation arrangement by share-based payment award current year vesting period     1 year        
2012 Plan | Tranche Two | New Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period     36 months        
2012 Plan | Tranche Two | Equity Settled RSUs | New Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period     3 years