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STOCKHOLDERS’ EQUITY (Details)
Apr. 30, 2019
vote
class
$ / shares
shares
Jul. 31, 2018
$ / shares
shares
Class of Stock [Line Items]    
Common stock, number of classes of stock | class 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) 185,900,407 172,858,082
Common stock, shares outstanding (in shares) 185,900,407 172,858,082
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) 153,349,844 135,109,672
Common stock, shares outstanding (in shares) 153,349,844 135,109,672
Common stock number of votes per share | vote 1  
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) 32,550,563 37,748,410
Common stock, shares outstanding (in shares) 32,550,563 37,748,410
Common stock number of votes per share | vote 10