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STOCKHOLDERS’ EQUITY (Details)
Jul. 31, 2018
vote
$ / shares
shares
Jul. 31, 2017
$ / shares
shares
Nov. 01, 2016
vote
class
Oct. 31, 2016
class
shares
Jul. 31, 2016
shares
Class of Stock [Line Items]          
Preferred stock, shares authorized (in shares) 200,000,000 200,000,000      
Preferred stock, par value (in dollars per share) | $ / shares $ 0.000025 $ 0.000025      
Preferred stock, shares issued (in shares) 0 0      
Common stock, number of classes of stock | class     2 2  
Common stock, shares authorized (in shares) 1,200,000,000 1,200,000,000      
Common stock, par value (in dollars per share) | $ / shares $ 0.000025 $ 0.000025      
Common stock, shares issued (in shares) 172,858,082 154,636,520      
Common stock, shares outstanding (in shares) 172,858,082 154,636,520      
Options outstanding (in shares) 11,332,554 20,334,531     26,166,968
Shares reserved for future issuance (in shares) 47,815,755        
2016 Plan          
Class of Stock [Line Items]          
Shares reserved for future issuance (in shares) 46,133,294        
RSUs          
Class of Stock [Line Items]          
RSUs outstanding (in shares) 23,597,499 17,376,090     12,265,369
Convertible preferred stock warrants | Common Class B Warrant          
Class of Stock [Line Items]          
Warrants or issued (in shares) 34,180        
Common Class A          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) 1,000,000,000 1,000,000,000      
Common stock, shares issued (in shares) 135,109,672 93,570,171      
Common stock, shares outstanding (in shares) 135,109,672 93,570,171      
Common stock number of votes per share | vote 1   1    
Common Class A | 2016 Plan          
Class of Stock [Line Items]          
Number of shares available for grant (in shares) 11,169,061.000        
Shares reserved for future issuance (in shares)       22,400,000  
Common Class B          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) 200,000,000 200,000,000      
Common stock, shares issued (in shares) 37,748,410 61,066,349      
Common stock, shares outstanding (in shares) 37,748,410 61,066,349      
Common stock number of votes per share | vote 10   10    
Employee stock purchase plan          
Class of Stock [Line Items]          
Shares reserved for future issuance (in shares) 1,682,461.000