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STOCKHOLDERS’ EQUITY (Details)
Jan. 31, 2020
vote
class
$ / shares
shares
Jul. 31, 2019
$ / 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) 194,654,000 188,595,000
Common stock, shares outstanding (in shares) 194,654,000 188,595,000
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) 179,562,000 168,155,000
Common stock, shares outstanding (in shares) 179,562,000 168,155,000
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) 15,092,000 20,440,000
Common stock, shares outstanding (in shares) 15,092,000 20,440,000
Common stock number of votes per share | vote 10