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Stock-Based Compensation - Schedule of Stock Options (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
$ / shares
shares
Jul. 31, 2019
USD ($)
$ / shares
shares
Outstanding Stock Options    
Beginning balance (in shares) | shares 8,861  
Granted (in shares) | shares 150  
Exercised (in shares) | shares (1,220)  
Canceled, forfeited, expired (in shares) | shares (297)  
Ending balance (in shares) | shares 7,494 8,861
Exercisable and expected to vest (in shares) | shares 3,469 3,311
Weighted-Average Exercise Price    
Beginning balance (in dollars per share) | $ / shares $ 7.16  
Granted (in dollars per share) | $ / shares 49.59  
Exercised (in dollars per share) | $ / shares 5.54  
Canceled, forfeited, expired (in dollars per share) | $ / shares 8.14  
Ending balance (in dollars per share) | $ / shares 8.24 $ 7.16
Exercisable and expected to vest (in dollars per share) | $ / shares $ 6.06 $ 5.60
Additional Disclosures    
Options outstanding, weighted average remaining contractual term 4 years 3 months 18 days 4 years 7 months 6 days
Exercisable and expected to vest, weighted average remaining contractual term 3 years 9 months 18 days 4 years
Options outstanding, aggregate intrinsic value | $ $ 358,629 $ 683,294
Exercised, aggregate intrinsic value | $ 62,182  
Exercisable and expected to vest, aggregate intrinsic value | $ $ 173,540 $ 260,479